EM example: Add generated thorn

14 files changed, 1717 insertions, 0 deletions

diff --git a/Examples/EM/configuration.ccl b/Examples/EM/configuration.ccl
new file mode 100644
index 0000000..023aac7
--- /dev/null
+++ b/Examples/EM/configuration.ccl
@@ -0,0 +1,3 @@
+# File produced by Kranc
+
+REQUIRES GenericFD
diff --git a/Examples/EM/interface.ccl b/Examples/EM/interface.ccl
new file mode 100644
index 0000000..58b38f2
--- /dev/null
+++ b/Examples/EM/interface.ccl
@@ -0,0 +1,72 @@
+# File produced by Kranc
+
+implements: EM
+
+inherits:   Grid GenericFD Boundary
+
+
+
+USES INCLUDE: GenericFD.h
+USES INCLUDE: Symmetry.h
+USES INCLUDE: sbp_calc_coeffs.h
+USES INCLUDE: Boundary.h
+
+CCTK_INT FUNCTION MoLRegisterEvolved(CCTK_INT IN EvolvedIndex, CCTK_INT IN RHSIndex)
+USES FUNCTION MoLRegisterEvolved
+
+SUBROUTINE Diff_coeff(CCTK_POINTER_TO_CONST IN cctkGH, CCTK_INT IN dir, CCTK_INT IN nsize, CCTK_INT OUT ARRAY imin, CCTK_INT OUT ARRAY imax, CCTK_REAL OUT ARRAY q, CCTK_INT IN table_handle)
+USES FUNCTION Diff_coeff
+
+CCTK_INT FUNCTION MultiPatch_GetMap(CCTK_POINTER_TO_CONST IN cctkGH)
+USES FUNCTION MultiPatch_GetMap
+
+CCTK_INT FUNCTION Boundary_SelectGroupForBC(CCTK_POINTER_TO_CONST IN GH, CCTK_INT IN faces, CCTK_INT IN boundary_width, CCTK_INT IN table_handle, CCTK_STRING IN group_name, CCTK_STRING IN bc_name)
+USES FUNCTION Boundary_SelectGroupForBC
+
+CCTK_INT FUNCTION Boundary_SelectVarForBC(CCTK_POINTER_TO_CONST IN GH, CCTK_INT IN faces, CCTK_INT IN boundary_width, CCTK_INT IN table_handle, CCTK_STRING IN var_name, CCTK_STRING IN bc_name)
+USES FUNCTION Boundary_SelectVarForBC
+
+public:
+CCTK_REAL constraints type=GF timelevels=1 tags=''
+{
+  CEl,
+  CB
+} "constraints"
+
+public:
+CCTK_REAL endens type=GF timelevels=1 tags=''
+{
+  rho
+} "endens"
+
+public:
+CCTK_REAL B_group type=GF timelevels=3 tags='tensortypealias="D" tensorweight=0'
+{
+  B1,
+  B2,
+  B3
+} "B_group"
+
+public:
+CCTK_REAL El_group type=GF timelevels=3 tags='tensortypealias="D" tensorweight=0'
+{
+  El1,
+  El2,
+  El3
+} "El_group"
+
+public:
+CCTK_REAL B_grouprhs type=GF timelevels=3 tags='tensortypealias="D" tensorweight=0'
+{
+  B1rhs,
+  B2rhs,
+  B3rhs
+} "B_grouprhs"
+
+public:
+CCTK_REAL El_grouprhs type=GF timelevels=3 tags='tensortypealias="D" tensorweight=0'
+{
+  El1rhs,
+  El2rhs,
+  El3rhs
+} "El_grouprhs"
diff --git a/Examples/EM/param.ccl b/Examples/EM/param.ccl
new file mode 100644
index 0000000..fad7962
--- /dev/null
+++ b/Examples/EM/param.ccl
@@ -0,0 +1,335 @@
+# File produced by Kranc
+
+
+shares: GenericFD
+
+
+
+shares: MethodOfLines
+
+USES CCTK_INT MoL_Num_Evolved_Vars
+
+restricted:
+CCTK_INT verbose "verbose" STEERABLE=ALWAYS
+{
+  *:* :: ""
+} 0
+
+restricted:
+CCTK_REAL sigma "sigma"
+{
+  "*:*" :: ""
+} 0
+
+restricted:
+CCTK_REAL hlleAlpha "hlleAlpha"
+{
+  "*:*" :: ""
+} 0
+
+restricted:
+CCTK_INT EM_MaxNumEvolvedVars "Number of evolved variables used by this thorn" ACCUMULATOR-BASE=MethodofLines::MoL_Num_Evolved_Vars STEERABLE=RECOVER
+{
+  6:6 :: "Number of evolved variables used by this thorn"
+} 6
+
+restricted:
+CCTK_INT timelevels "Number of active timelevels" STEERABLE=RECOVER
+{
+  0:3 :: ""
+} 3
+
+restricted:
+CCTK_INT rhs_timelevels "Number of active RHS timelevels" STEERABLE=RECOVER
+{
+  0:3 :: ""
+} 1
+
+restricted:
+CCTK_INT EM_initial_calc_every "EM_initial_calc_every" STEERABLE=ALWAYS
+{
+  *:* :: ""
+} 1
+
+restricted:
+CCTK_INT EM_evol_calc_every "EM_evol_calc_every" STEERABLE=ALWAYS
+{
+  *:* :: ""
+} 1
+
+restricted:
+CCTK_INT EM_constraints_calc_every "EM_constraints_calc_every" STEERABLE=ALWAYS
+{
+  *:* :: ""
+} 1
+
+restricted:
+CCTK_INT EM_energy_calc_every "EM_energy_calc_every" STEERABLE=ALWAYS
+{
+  *:* :: ""
+} 1
+
+restricted:
+CCTK_INT EM_initial_calc_offset "EM_initial_calc_offset" STEERABLE=ALWAYS
+{
+  *:* :: ""
+} 0
+
+restricted:
+CCTK_INT EM_evol_calc_offset "EM_evol_calc_offset" STEERABLE=ALWAYS
+{
+  *:* :: ""
+} 0
+
+restricted:
+CCTK_INT EM_constraints_calc_offset "EM_constraints_calc_offset" STEERABLE=ALWAYS
+{
+  *:* :: ""
+} 0
+
+restricted:
+CCTK_INT EM_energy_calc_offset "EM_energy_calc_offset" STEERABLE=ALWAYS
+{
+  *:* :: ""
+} 0
+
+private:
+KEYWORD B1_bound "Boundary condition to implement" STEERABLE=ALWAYS
+{
+  "flat" :: "Flat boundary condition"
+  "none" :: "No boundary condition"
+  "static" :: "Boundaries held fixed"
+  "radiative" :: "Radiation boundary condition"
+  "scalar" :: "Dirichlet boundary condition"
+  "newrad" :: "Improved radiative boundary condition"
+  "skip" :: "skip boundary condition code"
+} "skip"
+
+private:
+KEYWORD B2_bound "Boundary condition to implement" STEERABLE=ALWAYS
+{
+  "flat" :: "Flat boundary condition"
+  "none" :: "No boundary condition"
+  "static" :: "Boundaries held fixed"
+  "radiative" :: "Radiation boundary condition"
+  "scalar" :: "Dirichlet boundary condition"
+  "newrad" :: "Improved radiative boundary condition"
+  "skip" :: "skip boundary condition code"
+} "skip"
+
+private:
+KEYWORD B3_bound "Boundary condition to implement" STEERABLE=ALWAYS
+{
+  "flat" :: "Flat boundary condition"
+  "none" :: "No boundary condition"
+  "static" :: "Boundaries held fixed"
+  "radiative" :: "Radiation boundary condition"
+  "scalar" :: "Dirichlet boundary condition"
+  "newrad" :: "Improved radiative boundary condition"
+  "skip" :: "skip boundary condition code"
+} "skip"
+
+private:
+KEYWORD El1_bound "Boundary condition to implement" STEERABLE=ALWAYS
+{
+  "flat" :: "Flat boundary condition"
+  "none" :: "No boundary condition"
+  "static" :: "Boundaries held fixed"
+  "radiative" :: "Radiation boundary condition"
+  "scalar" :: "Dirichlet boundary condition"
+  "newrad" :: "Improved radiative boundary condition"
+  "skip" :: "skip boundary condition code"
+} "skip"
+
+private:
+KEYWORD El2_bound "Boundary condition to implement" STEERABLE=ALWAYS
+{
+  "flat" :: "Flat boundary condition"
+  "none" :: "No boundary condition"
+  "static" :: "Boundaries held fixed"
+  "radiative" :: "Radiation boundary condition"
+  "scalar" :: "Dirichlet boundary condition"
+  "newrad" :: "Improved radiative boundary condition"
+  "skip" :: "skip boundary condition code"
+} "skip"
+
+private:
+KEYWORD El3_bound "Boundary condition to implement" STEERABLE=ALWAYS
+{
+  "flat" :: "Flat boundary condition"
+  "none" :: "No boundary condition"
+  "static" :: "Boundaries held fixed"
+  "radiative" :: "Radiation boundary condition"
+  "scalar" :: "Dirichlet boundary condition"
+  "newrad" :: "Improved radiative boundary condition"
+  "skip" :: "skip boundary condition code"
+} "skip"
+
+private:
+KEYWORD B_group_bound "Boundary condition to implement" STEERABLE=ALWAYS
+{
+  "flat" :: "Flat boundary condition"
+  "none" :: "No boundary condition"
+  "static" :: "Boundaries held fixed"
+  "radiative" :: "Radiation boundary condition"
+  "scalar" :: "Dirichlet boundary condition"
+  "newrad" :: "Improved radiative boundary condition"
+  "skip" :: "skip boundary condition code"
+} "none"
+
+private:
+KEYWORD El_group_bound "Boundary condition to implement" STEERABLE=ALWAYS
+{
+  "flat" :: "Flat boundary condition"
+  "none" :: "No boundary condition"
+  "static" :: "Boundaries held fixed"
+  "radiative" :: "Radiation boundary condition"
+  "scalar" :: "Dirichlet boundary condition"
+  "newrad" :: "Improved radiative boundary condition"
+  "skip" :: "skip boundary condition code"
+} "none"
+
+private:
+CCTK_REAL B1_bound_speed "characteristic speed at boundary" STEERABLE=ALWAYS
+{
+  "0:*" :: "outgoing characteristic speed > 0"
+} 1.
+
+private:
+CCTK_REAL B2_bound_speed "characteristic speed at boundary" STEERABLE=ALWAYS
+{
+  "0:*" :: "outgoing characteristic speed > 0"
+} 1.
+
+private:
+CCTK_REAL B3_bound_speed "characteristic speed at boundary" STEERABLE=ALWAYS
+{
+  "0:*" :: "outgoing characteristic speed > 0"
+} 1.
+
+private:
+CCTK_REAL El1_bound_speed "characteristic speed at boundary" STEERABLE=ALWAYS
+{
+  "0:*" :: "outgoing characteristic speed > 0"
+} 1.
+
+private:
+CCTK_REAL El2_bound_speed "characteristic speed at boundary" STEERABLE=ALWAYS
+{
+  "0:*" :: "outgoing characteristic speed > 0"
+} 1.
+
+private:
+CCTK_REAL El3_bound_speed "characteristic speed at boundary" STEERABLE=ALWAYS
+{
+  "0:*" :: "outgoing characteristic speed > 0"
+} 1.
+
+private:
+CCTK_REAL B_group_bound_speed "characteristic speed at boundary" STEERABLE=ALWAYS
+{
+  "0:*" :: "outgoing characteristic speed > 0"
+} 1.
+
+private:
+CCTK_REAL El_group_bound_speed "characteristic speed at boundary" STEERABLE=ALWAYS
+{
+  "0:*" :: "outgoing characteristic speed > 0"
+} 1.
+
+private:
+CCTK_REAL B1_bound_limit "limit value for r -> infinity" STEERABLE=ALWAYS
+{
+  "*:*" :: "value of limit value is unrestricted"
+} 0.
+
+private:
+CCTK_REAL B2_bound_limit "limit value for r -> infinity" STEERABLE=ALWAYS
+{
+  "*:*" :: "value of limit value is unrestricted"
+} 0.
+
+private:
+CCTK_REAL B3_bound_limit "limit value for r -> infinity" STEERABLE=ALWAYS
+{
+  "*:*" :: "value of limit value is unrestricted"
+} 0.
+
+private:
+CCTK_REAL El1_bound_limit "limit value for r -> infinity" STEERABLE=ALWAYS
+{
+  "*:*" :: "value of limit value is unrestricted"
+} 0.
+
+private:
+CCTK_REAL El2_bound_limit "limit value for r -> infinity" STEERABLE=ALWAYS
+{
+  "*:*" :: "value of limit value is unrestricted"
+} 0.
+
+private:
+CCTK_REAL El3_bound_limit "limit value for r -> infinity" STEERABLE=ALWAYS
+{
+  "*:*" :: "value of limit value is unrestricted"
+} 0.
+
+private:
+CCTK_REAL B_group_bound_limit "limit value for r -> infinity" STEERABLE=ALWAYS
+{
+  "*:*" :: "value of limit value is unrestricted"
+} 0.
+
+private:
+CCTK_REAL El_group_bound_limit "limit value for r -> infinity" STEERABLE=ALWAYS
+{
+  "*:*" :: "value of limit value is unrestricted"
+} 0.
+
+private:
+CCTK_REAL B1_bound_scalar "Dirichlet boundary value" STEERABLE=ALWAYS
+{
+  "*:*" :: "unrestricted"
+} 0.
+
+private:
+CCTK_REAL B2_bound_scalar "Dirichlet boundary value" STEERABLE=ALWAYS
+{
+  "*:*" :: "unrestricted"
+} 0.
+
+private:
+CCTK_REAL B3_bound_scalar "Dirichlet boundary value" STEERABLE=ALWAYS
+{
+  "*:*" :: "unrestricted"
+} 0.
+
+private:
+CCTK_REAL El1_bound_scalar "Dirichlet boundary value" STEERABLE=ALWAYS
+{
+  "*:*" :: "unrestricted"
+} 0.
+
+private:
+CCTK_REAL El2_bound_scalar "Dirichlet boundary value" STEERABLE=ALWAYS
+{
+  "*:*" :: "unrestricted"
+} 0.
+
+private:
+CCTK_REAL El3_bound_scalar "Dirichlet boundary value" STEERABLE=ALWAYS
+{
+  "*:*" :: "unrestricted"
+} 0.
+
+private:
+CCTK_REAL B_group_bound_scalar "Dirichlet boundary value" STEERABLE=ALWAYS
+{
+  "*:*" :: "unrestricted"
+} 0.
+
+private:
+CCTK_REAL El_group_bound_scalar "Dirichlet boundary value" STEERABLE=ALWAYS
+{
+  "*:*" :: "unrestricted"
+} 0.
+
diff --git a/Examples/EM/schedule.ccl b/Examples/EM/schedule.ccl
new file mode 100644
index 0000000..fea3ede
--- /dev/null
+++ b/Examples/EM/schedule.ccl
@@ -0,0 +1,125 @@
+# File produced by Kranc
+
+
+STORAGE: constraints[1]
+
+STORAGE: endens[1]
+
+if (timelevels == 1)
+{
+  STORAGE: B_group[1]
+}
+if (timelevels == 2)
+{
+  STORAGE: B_group[2]
+}
+if (timelevels == 3)
+{
+  STORAGE: B_group[3]
+}
+
+if (timelevels == 1)
+{
+  STORAGE: El_group[1]
+}
+if (timelevels == 2)
+{
+  STORAGE: El_group[2]
+}
+if (timelevels == 3)
+{
+  STORAGE: El_group[3]
+}
+
+if (rhs_timelevels == 1)
+{
+  STORAGE: B_grouprhs[1]
+}
+if (rhs_timelevels == 2)
+{
+  STORAGE: B_grouprhs[2]
+}
+if (rhs_timelevels == 3)
+{
+  STORAGE: B_grouprhs[3]
+}
+
+if (rhs_timelevels == 1)
+{
+  STORAGE: El_grouprhs[1]
+}
+if (rhs_timelevels == 2)
+{
+  STORAGE: El_grouprhs[2]
+}
+if (rhs_timelevels == 3)
+{
+  STORAGE: El_grouprhs[3]
+}
+
+schedule EM_Startup at STARTUP
+{
+  LANG: C
+  OPTIONS: meta
+} "create banner"
+
+schedule EM_RegisterVars in MoL_Register
+{
+  LANG: C
+  OPTIONS: meta
+} "Register Variables for MoL"
+
+schedule EM_RegisterSymmetries in SymmetryRegister
+{
+  LANG: C
+  OPTIONS: meta
+} "register symmetries"
+
+schedule EM_initial at CCTK_INITIAL
+{
+  LANG: C
+} "EM_initial"
+
+schedule EM_evol in MoL_CalcRHS
+{
+  LANG: C
+} "EM_evol"
+
+schedule group EM_constraints_group in MoL_PseudoEvolution
+{
+  # no language specified
+} "EM_constraints"
+
+schedule EM_constraints in EM_constraints_group
+{
+  LANG: C
+} "EM_constraints"
+
+schedule group EM_energy_group in MoL_PseudoEvolution
+{
+  # no language specified
+} "EM_energy"
+
+schedule EM_energy in EM_energy_group
+{
+  LANG: C
+} "EM_energy"
+
+schedule EM_SelectBoundConds in MoL_PostStep
+{
+  LANG: C
+  OPTIONS: level
+  SYNC: B_group
+  SYNC: El_group
+} "select boundary conditions"
+
+schedule EM_CheckBoundaries at BASEGRID
+{
+  LANG: C
+  OPTIONS: meta
+} "check boundaries treatment"
+
+schedule group ApplyBCs as EM_ApplyBCs in MoL_PostStep after EM_SelectBoundConds
+{
+  # no language specified
+} "Apply boundary conditions controlled by thorn Boundary"
diff --git a/Examples/EM/src/Boundaries.cc b/Examples/EM/src/Boundaries.cc
new file mode 100644
index 0000000..c87be53
--- /dev/null
+++ b/Examples/EM/src/Boundaries.cc
@@ -0,0 +1,457 @@
+/*  File produced by Kranc */
+
+#include "cctk.h"
+#include "cctk_Arguments.h"
+#include "cctk_Parameters.h"
+#include "cctk_Faces.h"
+#include "util_Table.h"
+#include "Symmetry.h"
+
+
+/* the boundary treatment is split into 3 steps:    */
+/* 1. excision                                      */
+/* 2. symmetries                                    */
+/* 3. "other" boundary conditions, e.g. radiative */
+
+/* to simplify scheduling and testing, the 3 steps  */
+/* are currently applied in separate functions      */
+
+
+extern "C" void EM_CheckBoundaries(CCTK_ARGUMENTS)
+{
+  DECLARE_CCTK_ARGUMENTS;
+  DECLARE_CCTK_PARAMETERS;
+  
+  return;
+}
+
+extern "C" void EM_SelectBoundConds(CCTK_ARGUMENTS)
+{
+  DECLARE_CCTK_ARGUMENTS;
+  DECLARE_CCTK_PARAMETERS;
+  
+  CCTK_INT ierr = 0;
+  
+  if (CCTK_EQUALS(B_group_bound, "none"  ) ||
+      CCTK_EQUALS(B_group_bound, "static") ||
+      CCTK_EQUALS(B_group_bound, "flat"  ) ||
+      CCTK_EQUALS(B_group_bound, "zero"  ) )
+  {
+    ierr = Boundary_SelectGroupForBC(cctkGH, CCTK_ALL_FACES, 1, -1,
+                      "EM::B_group", B_group_bound);
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register B_group_bound BC for EM::B_group!");
+  }
+  
+  if (CCTK_EQUALS(El_group_bound, "none"  ) ||
+      CCTK_EQUALS(El_group_bound, "static") ||
+      CCTK_EQUALS(El_group_bound, "flat"  ) ||
+      CCTK_EQUALS(El_group_bound, "zero"  ) )
+  {
+    ierr = Boundary_SelectGroupForBC(cctkGH, CCTK_ALL_FACES, 1, -1,
+                      "EM::El_group", El_group_bound);
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register El_group_bound BC for EM::El_group!");
+  }
+  
+  if (CCTK_EQUALS(B1_bound, "none"  ) ||
+      CCTK_EQUALS(B1_bound, "static") ||
+      CCTK_EQUALS(B1_bound, "flat"  ) ||
+      CCTK_EQUALS(B1_bound, "zero"  ) )
+  {
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, -1,
+                      "EM::B1", B1_bound);
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register B1_bound BC for EM::B1!");
+  }
+  
+  if (CCTK_EQUALS(B2_bound, "none"  ) ||
+      CCTK_EQUALS(B2_bound, "static") ||
+      CCTK_EQUALS(B2_bound, "flat"  ) ||
+      CCTK_EQUALS(B2_bound, "zero"  ) )
+  {
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, -1,
+                      "EM::B2", B2_bound);
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register B2_bound BC for EM::B2!");
+  }
+  
+  if (CCTK_EQUALS(B3_bound, "none"  ) ||
+      CCTK_EQUALS(B3_bound, "static") ||
+      CCTK_EQUALS(B3_bound, "flat"  ) ||
+      CCTK_EQUALS(B3_bound, "zero"  ) )
+  {
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, -1,
+                      "EM::B3", B3_bound);
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register B3_bound BC for EM::B3!");
+  }
+  
+  if (CCTK_EQUALS(El1_bound, "none"  ) ||
+      CCTK_EQUALS(El1_bound, "static") ||
+      CCTK_EQUALS(El1_bound, "flat"  ) ||
+      CCTK_EQUALS(El1_bound, "zero"  ) )
+  {
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, -1,
+                      "EM::El1", El1_bound);
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register El1_bound BC for EM::El1!");
+  }
+  
+  if (CCTK_EQUALS(El2_bound, "none"  ) ||
+      CCTK_EQUALS(El2_bound, "static") ||
+      CCTK_EQUALS(El2_bound, "flat"  ) ||
+      CCTK_EQUALS(El2_bound, "zero"  ) )
+  {
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, -1,
+                      "EM::El2", El2_bound);
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register El2_bound BC for EM::El2!");
+  }
+  
+  if (CCTK_EQUALS(El3_bound, "none"  ) ||
+      CCTK_EQUALS(El3_bound, "static") ||
+      CCTK_EQUALS(El3_bound, "flat"  ) ||
+      CCTK_EQUALS(El3_bound, "zero"  ) )
+  {
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, -1,
+                      "EM::El3", El3_bound);
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register El3_bound BC for EM::El3!");
+  }
+  
+  if (CCTK_EQUALS(B_group_bound, "radiative"))
+  {
+   /* select radiation boundary condition */
+    static CCTK_INT handle_B_group_bound = -1;
+    if (handle_B_group_bound < 0) handle_B_group_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_B_group_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_B_group_bound , B_group_bound_limit, "LIMIT") < 0)
+       CCTK_WARN(0, "could not set LIMIT value in table!");
+    if (Util_TableSetReal(handle_B_group_bound ,B_group_bound_speed, "SPEED") < 0)
+       CCTK_WARN(0, "could not set SPEED value in table!");
+  
+    ierr = Boundary_SelectGroupForBC(cctkGH, CCTK_ALL_FACES, 1, handle_B_group_bound, 
+                      "EM::B_group", "Radiation");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register Radiation BC for EM::B_group!");
+  
+  }
+  
+  if (CCTK_EQUALS(El_group_bound, "radiative"))
+  {
+   /* select radiation boundary condition */
+    static CCTK_INT handle_El_group_bound = -1;
+    if (handle_El_group_bound < 0) handle_El_group_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_El_group_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_El_group_bound , El_group_bound_limit, "LIMIT") < 0)
+       CCTK_WARN(0, "could not set LIMIT value in table!");
+    if (Util_TableSetReal(handle_El_group_bound ,El_group_bound_speed, "SPEED") < 0)
+       CCTK_WARN(0, "could not set SPEED value in table!");
+  
+    ierr = Boundary_SelectGroupForBC(cctkGH, CCTK_ALL_FACES, 1, handle_El_group_bound, 
+                      "EM::El_group", "Radiation");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register Radiation BC for EM::El_group!");
+  
+  }
+  
+  if (CCTK_EQUALS(B1_bound, "radiative"))
+  {
+   /* select radiation boundary condition */
+    static CCTK_INT handle_B1_bound = -1;
+    if (handle_B1_bound < 0) handle_B1_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_B1_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_B1_bound , B1_bound_limit, "LIMIT") < 0)
+       CCTK_WARN(0, "could not set LIMIT value in table!");
+    if (Util_TableSetReal(handle_B1_bound ,B1_bound_speed, "SPEED") < 0)
+        CCTK_WARN(0, "could not set SPEED value in table!");
+  
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, handle_B1_bound, 
+                      "EM::B1", "Radiation");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register Radiation BC for EM::B1!");
+  
+  }
+  
+  if (CCTK_EQUALS(B2_bound, "radiative"))
+  {
+   /* select radiation boundary condition */
+    static CCTK_INT handle_B2_bound = -1;
+    if (handle_B2_bound < 0) handle_B2_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_B2_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_B2_bound , B2_bound_limit, "LIMIT") < 0)
+       CCTK_WARN(0, "could not set LIMIT value in table!");
+    if (Util_TableSetReal(handle_B2_bound ,B2_bound_speed, "SPEED") < 0)
+        CCTK_WARN(0, "could not set SPEED value in table!");
+  
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, handle_B2_bound, 
+                      "EM::B2", "Radiation");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register Radiation BC for EM::B2!");
+  
+  }
+  
+  if (CCTK_EQUALS(B3_bound, "radiative"))
+  {
+   /* select radiation boundary condition */
+    static CCTK_INT handle_B3_bound = -1;
+    if (handle_B3_bound < 0) handle_B3_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_B3_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_B3_bound , B3_bound_limit, "LIMIT") < 0)
+       CCTK_WARN(0, "could not set LIMIT value in table!");
+    if (Util_TableSetReal(handle_B3_bound ,B3_bound_speed, "SPEED") < 0)
+        CCTK_WARN(0, "could not set SPEED value in table!");
+  
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, handle_B3_bound, 
+                      "EM::B3", "Radiation");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register Radiation BC for EM::B3!");
+  
+  }
+  
+  if (CCTK_EQUALS(El1_bound, "radiative"))
+  {
+   /* select radiation boundary condition */
+    static CCTK_INT handle_El1_bound = -1;
+    if (handle_El1_bound < 0) handle_El1_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_El1_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_El1_bound , El1_bound_limit, "LIMIT") < 0)
+       CCTK_WARN(0, "could not set LIMIT value in table!");
+    if (Util_TableSetReal(handle_El1_bound ,El1_bound_speed, "SPEED") < 0)
+        CCTK_WARN(0, "could not set SPEED value in table!");
+  
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, handle_El1_bound, 
+                      "EM::El1", "Radiation");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register Radiation BC for EM::El1!");
+  
+  }
+  
+  if (CCTK_EQUALS(El2_bound, "radiative"))
+  {
+   /* select radiation boundary condition */
+    static CCTK_INT handle_El2_bound = -1;
+    if (handle_El2_bound < 0) handle_El2_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_El2_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_El2_bound , El2_bound_limit, "LIMIT") < 0)
+       CCTK_WARN(0, "could not set LIMIT value in table!");
+    if (Util_TableSetReal(handle_El2_bound ,El2_bound_speed, "SPEED") < 0)
+        CCTK_WARN(0, "could not set SPEED value in table!");
+  
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, handle_El2_bound, 
+                      "EM::El2", "Radiation");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register Radiation BC for EM::El2!");
+  
+  }
+  
+  if (CCTK_EQUALS(El3_bound, "radiative"))
+  {
+   /* select radiation boundary condition */
+    static CCTK_INT handle_El3_bound = -1;
+    if (handle_El3_bound < 0) handle_El3_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_El3_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_El3_bound , El3_bound_limit, "LIMIT") < 0)
+       CCTK_WARN(0, "could not set LIMIT value in table!");
+    if (Util_TableSetReal(handle_El3_bound ,El3_bound_speed, "SPEED") < 0)
+        CCTK_WARN(0, "could not set SPEED value in table!");
+  
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, handle_El3_bound, 
+                      "EM::El3", "Radiation");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register Radiation BC for EM::El3!");
+  
+  }
+  
+  if (CCTK_EQUALS(B_group_bound, "scalar"))
+  {
+   /* select scalar boundary condition */
+    static CCTK_INT handle_B_group_bound = -1;
+    if (handle_B_group_bound < 0) handle_B_group_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_B_group_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_B_group_bound ,B_group_bound_scalar, "SCALAR") < 0)
+        CCTK_WARN(0, "could not set SCALAR value in table!");
+  
+    ierr = Boundary_SelectGroupForBC(cctkGH, CCTK_ALL_FACES, 1, handle_B_group_bound, 
+                      "EM::B_group", "scalar");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register Scalar BC for EM::B_group!");
+  
+  }
+  
+  if (CCTK_EQUALS(El_group_bound, "scalar"))
+  {
+   /* select scalar boundary condition */
+    static CCTK_INT handle_El_group_bound = -1;
+    if (handle_El_group_bound < 0) handle_El_group_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_El_group_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_El_group_bound ,El_group_bound_scalar, "SCALAR") < 0)
+        CCTK_WARN(0, "could not set SCALAR value in table!");
+  
+    ierr = Boundary_SelectGroupForBC(cctkGH, CCTK_ALL_FACES, 1, handle_El_group_bound, 
+                      "EM::El_group", "scalar");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Failed to register Scalar BC for EM::El_group!");
+  
+  }
+  
+  if (CCTK_EQUALS(B1_bound, "scalar"))
+  {
+   /* select scalar boundary condition */
+    static CCTK_INT handle_B1_bound = -1;
+    if (handle_B1_bound < 0) handle_B1_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_B1_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_B1_bound ,B1_bound_scalar, "SCALAR") < 0)
+      CCTK_WARN(0, "could not set SCALAR value in table!");
+  
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, handle_B1_bound, 
+                      "EM::B1", "scalar");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Error in registering Scalar BC for EM::B1!");
+  
+  }
+  
+  if (CCTK_EQUALS(B2_bound, "scalar"))
+  {
+   /* select scalar boundary condition */
+    static CCTK_INT handle_B2_bound = -1;
+    if (handle_B2_bound < 0) handle_B2_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_B2_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_B2_bound ,B2_bound_scalar, "SCALAR") < 0)
+      CCTK_WARN(0, "could not set SCALAR value in table!");
+  
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, handle_B2_bound, 
+                      "EM::B2", "scalar");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Error in registering Scalar BC for EM::B2!");
+  
+  }
+  
+  if (CCTK_EQUALS(B3_bound, "scalar"))
+  {
+   /* select scalar boundary condition */
+    static CCTK_INT handle_B3_bound = -1;
+    if (handle_B3_bound < 0) handle_B3_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_B3_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_B3_bound ,B3_bound_scalar, "SCALAR") < 0)
+      CCTK_WARN(0, "could not set SCALAR value in table!");
+  
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, handle_B3_bound, 
+                      "EM::B3", "scalar");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Error in registering Scalar BC for EM::B3!");
+  
+  }
+  
+  if (CCTK_EQUALS(El1_bound, "scalar"))
+  {
+   /* select scalar boundary condition */
+    static CCTK_INT handle_El1_bound = -1;
+    if (handle_El1_bound < 0) handle_El1_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_El1_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_El1_bound ,El1_bound_scalar, "SCALAR") < 0)
+      CCTK_WARN(0, "could not set SCALAR value in table!");
+  
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, handle_El1_bound, 
+                      "EM::El1", "scalar");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Error in registering Scalar BC for EM::El1!");
+  
+  }
+  
+  if (CCTK_EQUALS(El2_bound, "scalar"))
+  {
+   /* select scalar boundary condition */
+    static CCTK_INT handle_El2_bound = -1;
+    if (handle_El2_bound < 0) handle_El2_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_El2_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_El2_bound ,El2_bound_scalar, "SCALAR") < 0)
+      CCTK_WARN(0, "could not set SCALAR value in table!");
+  
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, handle_El2_bound, 
+                      "EM::El2", "scalar");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Error in registering Scalar BC for EM::El2!");
+  
+  }
+  
+  if (CCTK_EQUALS(El3_bound, "scalar"))
+  {
+   /* select scalar boundary condition */
+    static CCTK_INT handle_El3_bound = -1;
+    if (handle_El3_bound < 0) handle_El3_bound = Util_TableCreate(UTIL_TABLE_FLAGS_CASE_INSENSITIVE);
+    if (handle_El3_bound < 0) CCTK_WARN(0, "could not create table!");
+    if (Util_TableSetReal(handle_El3_bound ,El3_bound_scalar, "SCALAR") < 0)
+      CCTK_WARN(0, "could not set SCALAR value in table!");
+  
+    ierr = Boundary_SelectVarForBC(cctkGH, CCTK_ALL_FACES, 1, handle_El3_bound, 
+                      "EM::El3", "scalar");
+  
+    if (ierr < 0)
+       CCTK_WARN(0, "Error in registering Scalar BC for EM::El3!");
+  
+  }
+  return;
+}
+
+
+
+/* template for entries in parameter file:
+#$bound$#EM::B_group_bound       = "skip"
+#$bound$#EM::B_group_bound_speed = 1.0
+#$bound$#EM::B_group_bound_limit = 0.0
+#$bound$#EM::B_group_bound_scalar = 0.0
+
+#$bound$#EM::El_group_bound       = "skip"
+#$bound$#EM::El_group_bound_speed = 1.0
+#$bound$#EM::El_group_bound_limit = 0.0
+#$bound$#EM::El_group_bound_scalar = 0.0
+
+#$bound$#EM::B1_bound       = "skip"
+#$bound$#EM::B1_bound_speed = 1.0
+#$bound$#EM::B1_bound_limit = 0.0
+#$bound$#EM::B1_bound_scalar = 0.0
+
+#$bound$#EM::B2_bound       = "skip"
+#$bound$#EM::B2_bound_speed = 1.0
+#$bound$#EM::B2_bound_limit = 0.0
+#$bound$#EM::B2_bound_scalar = 0.0
+
+#$bound$#EM::B3_bound       = "skip"
+#$bound$#EM::B3_bound_speed = 1.0
+#$bound$#EM::B3_bound_limit = 0.0
+#$bound$#EM::B3_bound_scalar = 0.0
+
+#$bound$#EM::El1_bound       = "skip"
+#$bound$#EM::El1_bound_speed = 1.0
+#$bound$#EM::El1_bound_limit = 0.0
+#$bound$#EM::El1_bound_scalar = 0.0
+
+#$bound$#EM::El2_bound       = "skip"
+#$bound$#EM::El2_bound_speed = 1.0
+#$bound$#EM::El2_bound_limit = 0.0
+#$bound$#EM::El2_bound_scalar = 0.0
+
+#$bound$#EM::El3_bound       = "skip"
+#$bound$#EM::El3_bound_speed = 1.0
+#$bound$#EM::El3_bound_limit = 0.0
+#$bound$#EM::El3_bound_scalar = 0.0
+
+*/
+
diff --git a/Examples/EM/src/Differencing.h b/Examples/EM/src/Differencing.h
new file mode 100644
index 0000000..7740e61
--- /dev/null
+++ b/Examples/EM/src/Differencing.h
@@ -0,0 +1,36 @@
+#define PDstandard2nd1(u) (p1o2dx*(-(u)[di*(-1)+dj*(0)+dk*(0)] + (u)[di*(1)+dj*(0)+dk*(0)]))
+#define PDstandard2nd2(u) (p1o2dy*(-(u)[di*(0)+dj*(-1)+dk*(0)] + (u)[di*(0)+dj*(1)+dk*(0)]))
+#define PDstandard2nd3(u) (p1o2dz*(-(u)[di*(0)+dj*(0)+dk*(-1)] + (u)[di*(0)+dj*(0)+dk*(1)]))
+#define PDstandard2nd11(u) (p1odx2*(-2*(u)[di*(0)+dj*(0)+dk*(0)] + (u)[di*(-1)+dj*(0)+dk*(0)] + (u)[di*(1)+dj*(0)+dk*(0)]))
+#define PDstandard2nd22(u) (p1ody2*(-2*(u)[di*(0)+dj*(0)+dk*(0)] + (u)[di*(0)+dj*(-1)+dk*(0)] + (u)[di*(0)+dj*(1)+dk*(0)]))
+#define PDstandard2nd33(u) (p1odz2*(-2*(u)[di*(0)+dj*(0)+dk*(0)] + (u)[di*(0)+dj*(0)+dk*(-1)] + (u)[di*(0)+dj*(0)+dk*(1)]))
+#define PDstandard2nd12(u) (p1o4dxdy*((u)[di*(-1)+dj*(-1)+dk*(0)] - (u)[di*(-1)+dj*(1)+dk*(0)] - (u)[di*(1)+dj*(-1)+dk*(0)] + (u)[di*(1)+dj*(1)+dk*(0)]))
+#define PDstandard2nd13(u) (p1o4dxdz*((u)[di*(-1)+dj*(0)+dk*(-1)] - (u)[di*(-1)+dj*(0)+dk*(1)] - (u)[di*(1)+dj*(0)+dk*(-1)] + (u)[di*(1)+dj*(0)+dk*(1)]))
+#define PDstandard2nd21(u) (p1o4dxdy*((u)[di*(-1)+dj*(-1)+dk*(0)] - (u)[di*(-1)+dj*(1)+dk*(0)] - (u)[di*(1)+dj*(-1)+dk*(0)] + (u)[di*(1)+dj*(1)+dk*(0)]))
+#define PDstandard2nd23(u) (p1o4dydz*((u)[di*(0)+dj*(-1)+dk*(-1)] - (u)[di*(0)+dj*(-1)+dk*(1)] - (u)[di*(0)+dj*(1)+dk*(-1)] + (u)[di*(0)+dj*(1)+dk*(1)]))
+#define PDstandard2nd31(u) (p1o4dxdz*((u)[di*(-1)+dj*(0)+dk*(-1)] - (u)[di*(-1)+dj*(0)+dk*(1)] - (u)[di*(1)+dj*(0)+dk*(-1)] + (u)[di*(1)+dj*(0)+dk*(1)]))
+#define PDstandard2nd32(u) (p1o4dydz*((u)[di*(0)+dj*(-1)+dk*(-1)] - (u)[di*(0)+dj*(-1)+dk*(1)] - (u)[di*(0)+dj*(1)+dk*(-1)] + (u)[di*(0)+dj*(1)+dk*(1)]))
+#define PDstandard4th1(u) (p1o12dx*(-8*(u)[di*(-1)+dj*(0)+dk*(0)] + 8*(u)[di*(1)+dj*(0)+dk*(0)] + (u)[di*(-2)+dj*(0)+dk*(0)] - (u)[di*(2)+dj*(0)+dk*(0)]))
+#define PDstandard4th2(u) (p1o12dy*(-8*(u)[di*(0)+dj*(-1)+dk*(0)] + 8*(u)[di*(0)+dj*(1)+dk*(0)] + (u)[di*(0)+dj*(-2)+dk*(0)] - (u)[di*(0)+dj*(2)+dk*(0)]))
+#define PDstandard4th3(u) (p1o12dz*(-8*(u)[di*(0)+dj*(0)+dk*(-1)] + 8*(u)[di*(0)+dj*(0)+dk*(1)] + (u)[di*(0)+dj*(0)+dk*(-2)] - (u)[di*(0)+dj*(0)+dk*(2)]))
+#define PDstandard4th11(u) (pm1o12dx2*(30*(u)[di*(0)+dj*(0)+dk*(0)] - 16*((u)[di*(-1)+dj*(0)+dk*(0)] + (u)[di*(1)+dj*(0)+dk*(0)]) + (u)[di*(-2)+dj*(0)+dk*(0)] + (u)[di*(2)+dj*(0)+dk*(0)]))
+#define PDstandard4th22(u) (pm1o12dy2*(30*(u)[di*(0)+dj*(0)+dk*(0)] - 16*((u)[di*(0)+dj*(-1)+dk*(0)] + (u)[di*(0)+dj*(1)+dk*(0)]) + (u)[di*(0)+dj*(-2)+dk*(0)] + (u)[di*(0)+dj*(2)+dk*(0)]))
+#define PDstandard4th33(u) (pm1o12dz2*(30*(u)[di*(0)+dj*(0)+dk*(0)] - 16*((u)[di*(0)+dj*(0)+dk*(-1)] + (u)[di*(0)+dj*(0)+dk*(1)]) + (u)[di*(0)+dj*(0)+dk*(-2)] + (u)[di*(0)+dj*(0)+dk*(2)]))
+#define PDstandard4th12(u) (p1o144dxdy*(-64*((u)[di*(-1)+dj*(1)+dk*(0)] + (u)[di*(1)+dj*(-1)+dk*(0)]) + 64*((u)[di*(-1)+dj*(-1)+dk*(0)] + (u)[di*(1)+dj*(1)+dk*(0)]) + 8*((u)[di*(-1)+dj*(2)+dk*(0)] + (u)[di*(1)+dj*(-2)+dk*(0)] + (u)[di*(-2)+dj*(1)+dk*(0)] + (u)[di*(2)+dj*(-1)+dk*(0)]) - 8*((u)[di*(-1)+dj*(-2)+dk*(0)] + (u)[di*(1)+dj*(2)+dk*(0)] + (u)[di*(-2)+dj*(-1)+dk*(0)] + (u)[di*(2)+dj*(1)+dk*(0)]) + (u)[di*(-2)+dj*(-2)+dk*(0)] - (u)[di*(-2)+dj*(2)+dk*(0)] - (u)[di*(2)+dj*(-2)+dk*(0)] + (u)[di*(2)+dj*(2)+dk*(0)]))
+#define PDstandard4th13(u) (p1o144dxdz*(-64*((u)[di*(-1)+dj*(0)+dk*(1)] + (u)[di*(1)+dj*(0)+dk*(-1)]) + 64*((u)[di*(-1)+dj*(0)+dk*(-1)] + (u)[di*(1)+dj*(0)+dk*(1)]) + 8*((u)[di*(-1)+dj*(0)+dk*(2)] + (u)[di*(1)+dj*(0)+dk*(-2)] + (u)[di*(-2)+dj*(0)+dk*(1)] + (u)[di*(2)+dj*(0)+dk*(-1)]) - 8*((u)[di*(-1)+dj*(0)+dk*(-2)] + (u)[di*(1)+dj*(0)+dk*(2)] + (u)[di*(-2)+dj*(0)+dk*(-1)] + (u)[di*(2)+dj*(0)+dk*(1)]) + (u)[di*(-2)+dj*(0)+dk*(-2)] - (u)[di*(-2)+dj*(0)+dk*(2)] - (u)[di*(2)+dj*(0)+dk*(-2)] + (u)[di*(2)+dj*(0)+dk*(2)]))
+#define PDstandard4th21(u) (p1o144dxdy*(-64*((u)[di*(-1)+dj*(1)+dk*(0)] + (u)[di*(1)+dj*(-1)+dk*(0)]) + 64*((u)[di*(-1)+dj*(-1)+dk*(0)] + (u)[di*(1)+dj*(1)+dk*(0)]) + 8*((u)[di*(-1)+dj*(2)+dk*(0)] + (u)[di*(1)+dj*(-2)+dk*(0)] + (u)[di*(-2)+dj*(1)+dk*(0)] + (u)[di*(2)+dj*(-1)+dk*(0)]) - 8*((u)[di*(-1)+dj*(-2)+dk*(0)] + (u)[di*(1)+dj*(2)+dk*(0)] + (u)[di*(-2)+dj*(-1)+dk*(0)] + (u)[di*(2)+dj*(1)+dk*(0)]) + (u)[di*(-2)+dj*(-2)+dk*(0)] - (u)[di*(-2)+dj*(2)+dk*(0)] - (u)[di*(2)+dj*(-2)+dk*(0)] + (u)[di*(2)+dj*(2)+dk*(0)]))
+#define PDstandard4th23(u) (p1o144dydz*(-64*((u)[di*(0)+dj*(-1)+dk*(1)] + (u)[di*(0)+dj*(1)+dk*(-1)]) + 64*((u)[di*(0)+dj*(-1)+dk*(-1)] + (u)[di*(0)+dj*(1)+dk*(1)]) + 8*((u)[di*(0)+dj*(-1)+dk*(2)] + (u)[di*(0)+dj*(1)+dk*(-2)] + (u)[di*(0)+dj*(-2)+dk*(1)] + (u)[di*(0)+dj*(2)+dk*(-1)]) - 8*((u)[di*(0)+dj*(-1)+dk*(-2)] + (u)[di*(0)+dj*(1)+dk*(2)] + (u)[di*(0)+dj*(-2)+dk*(-1)] + (u)[di*(0)+dj*(2)+dk*(1)]) + (u)[di*(0)+dj*(-2)+dk*(-2)] - (u)[di*(0)+dj*(-2)+dk*(2)] - (u)[di*(0)+dj*(2)+dk*(-2)] + (u)[di*(0)+dj*(2)+dk*(2)]))
+#define PDstandard4th31(u) (p1o144dxdz*(-64*((u)[di*(-1)+dj*(0)+dk*(1)] + (u)[di*(1)+dj*(0)+dk*(-1)]) + 64*((u)[di*(-1)+dj*(0)+dk*(-1)] + (u)[di*(1)+dj*(0)+dk*(1)]) + 8*((u)[di*(-1)+dj*(0)+dk*(2)] + (u)[di*(1)+dj*(0)+dk*(-2)] + (u)[di*(-2)+dj*(0)+dk*(1)] + (u)[di*(2)+dj*(0)+dk*(-1)]) - 8*((u)[di*(-1)+dj*(0)+dk*(-2)] + (u)[di*(1)+dj*(0)+dk*(2)] + (u)[di*(-2)+dj*(0)+dk*(-1)] + (u)[di*(2)+dj*(0)+dk*(1)]) + (u)[di*(-2)+dj*(0)+dk*(-2)] - (u)[di*(-2)+dj*(0)+dk*(2)] - (u)[di*(2)+dj*(0)+dk*(-2)] + (u)[di*(2)+dj*(0)+dk*(2)]))
+#define PDstandard4th32(u) (p1o144dydz*(-64*((u)[di*(0)+dj*(-1)+dk*(1)] + (u)[di*(0)+dj*(1)+dk*(-1)]) + 64*((u)[di*(0)+dj*(-1)+dk*(-1)] + (u)[di*(0)+dj*(1)+dk*(1)]) + 8*((u)[di*(0)+dj*(-1)+dk*(2)] + (u)[di*(0)+dj*(1)+dk*(-2)] + (u)[di*(0)+dj*(-2)+dk*(1)] + (u)[di*(0)+dj*(2)+dk*(-1)]) - 8*((u)[di*(0)+dj*(-1)+dk*(-2)] + (u)[di*(0)+dj*(1)+dk*(2)] + (u)[di*(0)+dj*(-2)+dk*(-1)] + (u)[di*(0)+dj*(2)+dk*(1)]) + (u)[di*(0)+dj*(-2)+dk*(-2)] - (u)[di*(0)+dj*(-2)+dk*(2)] - (u)[di*(0)+dj*(2)+dk*(-2)] + (u)[di*(0)+dj*(2)+dk*(2)]))
+#define DiffPlus1(u) (p1o1*(-(u)[di*(0)+dj*(0)+dk*(0)] + (u)[di*(1)+dj*(0)+dk*(0)]))
+#define DiffPlus2(u) (p1o1*(-(u)[di*(0)+dj*(0)+dk*(0)] + (u)[di*(0)+dj*(1)+dk*(0)]))
+#define DiffPlus3(u) (p1o1*(-(u)[di*(0)+dj*(0)+dk*(0)] + (u)[di*(0)+dj*(0)+dk*(1)]))
+#define DiffMinus1(u) (p1o1*((u)[di*(0)+dj*(0)+dk*(0)] - (u)[di*(-1)+dj*(0)+dk*(0)]))
+#define DiffMinus2(u) (p1o1*((u)[di*(0)+dj*(0)+dk*(0)] - (u)[di*(0)+dj*(-1)+dk*(0)]))
+#define DiffMinus3(u) (p1o1*((u)[di*(0)+dj*(0)+dk*(0)] - (u)[di*(0)+dj*(0)+dk*(-1)]))
+#define ShiftMinus1(u) (p1o1*(u)[di*(-1)+dj*(0)+dk*(0)])
+#define ShiftMinus2(u) (p1o1*(u)[di*(0)+dj*(-1)+dk*(0)])
+#define ShiftMinus3(u) (p1o1*(u)[di*(0)+dj*(0)+dk*(-1)])
+#define PDplus1(u) (p1odx*(-(u)[di*(0)+dj*(0)+dk*(0)] + (u)[di*(1)+dj*(0)+dk*(0)]))
+#define PDplus2(u) (p1ody*(-(u)[di*(0)+dj*(0)+dk*(0)] + (u)[di*(0)+dj*(1)+dk*(0)]))
+#define PDplus3(u) (p1odz*(-(u)[di*(0)+dj*(0)+dk*(0)] + (u)[di*(0)+dj*(0)+dk*(1)]))
diff --git a/Examples/EM/src/EM_constraints.cc b/Examples/EM/src/EM_constraints.cc
new file mode 100644
index 0000000..d26cb66
--- /dev/null
+++ b/Examples/EM/src/EM_constraints.cc
@@ -0,0 +1,146 @@
+/*  File produced by Kranc */
+
+#define KRANC_C
+
+#include <assert.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "cctk.h"
+#include "cctk_Arguments.h"
+#include "cctk_Parameters.h"
+#include "GenericFD.h"
+#include "Differencing.h"
+
+/* Define macros used in calculations */
+#define INITVALUE (42)
+#define QAD(x) (SQR(SQR(x)))
+#define INV(x) ((1.0) / (x))
+#define SQR(x) ((x) * (x))
+#define CUB(x) ((x) * (x) * (x))
+
+static void EM_constraints_Body(cGH const * restrict const cctkGH, int const dir, int const face, CCTK_REAL const normal[3], CCTK_REAL const tangentA[3], CCTK_REAL const tangentB[3], int const min[3], int const max[3], int const n_subblock_gfs, CCTK_REAL * restrict const subblock_gfs[])
+{
+  DECLARE_CCTK_ARGUMENTS;
+  DECLARE_CCTK_PARAMETERS;
+  
+  
+  /* Declare the variables used for looping over grid points */
+  CCTK_INT i, j, k;
+  // CCTK_INT index = INITVALUE;
+  
+  /* Declare finite differencing variables */
+  
+  if (verbose > 1)
+  {
+    CCTK_VInfo(CCTK_THORNSTRING,"Entering EM_constraints_Body");
+  }
+  
+  if (cctk_iteration % EM_constraints_calc_every != EM_constraints_calc_offset)
+  {
+    return;
+  }
+  
+  const char *groups[] = {"EM::B_group","EM::constraints","EM::El_group"};
+  GenericFD_AssertGroupStorage(cctkGH, "EM_constraints", 3, groups);
+  
+  GenericFD_EnsureStencilFits(cctkGH, "EM_constraints", 1, 1, 1);
+  
+  /* Include user-supplied include files */
+  
+  /* Initialise finite differencing variables */
+  ptrdiff_t const di = 1;
+  ptrdiff_t const dj = CCTK_GFINDEX3D(cctkGH,0,1,0) - CCTK_GFINDEX3D(cctkGH,0,0,0);
+  ptrdiff_t const dk = CCTK_GFINDEX3D(cctkGH,0,0,1) - CCTK_GFINDEX3D(cctkGH,0,0,0);
+  CCTK_REAL const dx = ToReal(CCTK_DELTA_SPACE(0));
+  CCTK_REAL const dy = ToReal(CCTK_DELTA_SPACE(1));
+  CCTK_REAL const dz = ToReal(CCTK_DELTA_SPACE(2));
+  CCTK_REAL const dt = ToReal(CCTK_DELTA_TIME);
+  CCTK_REAL const dxi = INV(dx);
+  CCTK_REAL const dyi = INV(dy);
+  CCTK_REAL const dzi = INV(dz);
+  CCTK_REAL const khalf = 0.5;
+  CCTK_REAL const kthird = 1/3.0;
+  CCTK_REAL const ktwothird = 2.0/3.0;
+  CCTK_REAL const kfourthird = 4.0/3.0;
+  CCTK_REAL const keightthird = 8.0/3.0;
+  CCTK_REAL const hdxi = 0.5 * dxi;
+  CCTK_REAL const hdyi = 0.5 * dyi;
+  CCTK_REAL const hdzi = 0.5 * dzi;
+  
+  /* Initialize predefined quantities */
+  CCTK_REAL const p1o1 = 1;
+  CCTK_REAL const p1o12dx = 0.0833333333333333333333333333333*INV(dx);
+  CCTK_REAL const p1o12dy = 0.0833333333333333333333333333333*INV(dy);
+  CCTK_REAL const p1o12dz = 0.0833333333333333333333333333333*INV(dz);
+  CCTK_REAL const p1o144dxdy = 0.00694444444444444444444444444444*INV(dx)*INV(dy);
+  CCTK_REAL const p1o144dxdz = 0.00694444444444444444444444444444*INV(dx)*INV(dz);
+  CCTK_REAL const p1o144dydz = 0.00694444444444444444444444444444*INV(dy)*INV(dz);
+  CCTK_REAL const p1o2dx = 0.5*INV(dx);
+  CCTK_REAL const p1o2dy = 0.5*INV(dy);
+  CCTK_REAL const p1o2dz = 0.5*INV(dz);
+  CCTK_REAL const p1o4dxdy = 0.25*INV(dx)*INV(dy);
+  CCTK_REAL const p1o4dxdz = 0.25*INV(dx)*INV(dz);
+  CCTK_REAL const p1o4dydz = 0.25*INV(dy)*INV(dz);
+  CCTK_REAL const p1odx = INV(dx);
+  CCTK_REAL const p1odx2 = INV(SQR(dx));
+  CCTK_REAL const p1ody = INV(dy);
+  CCTK_REAL const p1ody2 = INV(SQR(dy));
+  CCTK_REAL const p1odz = INV(dz);
+  CCTK_REAL const p1odz2 = INV(SQR(dz));
+  CCTK_REAL const pm1o12dx2 = -0.0833333333333333333333333333333*INV(SQR(dx));
+  CCTK_REAL const pm1o12dy2 = -0.0833333333333333333333333333333*INV(SQR(dy));
+  CCTK_REAL const pm1o12dz2 = -0.0833333333333333333333333333333*INV(SQR(dz));
+  
+  /* Loop over the grid points */
+  for (k = min[2]; k < max[2]; k++)
+  {
+    for (j = min[1]; j < max[1]; j++)
+    {
+      for (i = min[0]; i < max[0]; i++)
+      {
+         int  const  index  =  CCTK_GFINDEX3D(cctkGH,i,j,k) ;
+        
+        /* Assign local copies of grid functions */
+        
+        CCTK_REAL B1L = B1[index];
+        CCTK_REAL B2L = B2[index];
+        CCTK_REAL B3L = B3[index];
+        CCTK_REAL El1L = El1[index];
+        CCTK_REAL El2L = El2[index];
+        CCTK_REAL El3L = El3[index];
+        
+        
+        /* Include user supplied include files */
+        
+        /* Precompute derivatives */
+        CCTK_REAL const PDstandard2nd1B1 = PDstandard2nd1(&B1[index]);
+        CCTK_REAL const PDstandard2nd2B2 = PDstandard2nd2(&B2[index]);
+        CCTK_REAL const PDstandard2nd3B3 = PDstandard2nd3(&B3[index]);
+        CCTK_REAL const PDstandard2nd1El1 = PDstandard2nd1(&El1[index]);
+        CCTK_REAL const PDstandard2nd2El2 = PDstandard2nd2(&El2[index]);
+        CCTK_REAL const PDstandard2nd3El3 = PDstandard2nd3(&El3[index]);
+        
+        /* Calculate temporaries and grid functions */
+        CCTK_REAL CElL = PDstandard2nd1El1 + PDstandard2nd2El2 + 
+          PDstandard2nd3El3;
+        
+        CCTK_REAL CBL = PDstandard2nd1B1 + PDstandard2nd2B2 + 
+          PDstandard2nd3B3;
+        
+        /* Copy local copies back to grid functions */
+        CB[index] = CBL;
+        CEl[index] = CElL;
+      }
+    }
+  }
+}
+
+extern "C" void EM_constraints(CCTK_ARGUMENTS)
+{
+  DECLARE_CCTK_ARGUMENTS;
+  DECLARE_CCTK_PARAMETERS;
+  
+  GenericFD_LoopOverEverything(cctkGH, &EM_constraints_Body);
+}
diff --git a/Examples/EM/src/EM_energy.cc b/Examples/EM/src/EM_energy.cc
new file mode 100644
index 0000000..2318bd8
--- /dev/null
+++ b/Examples/EM/src/EM_energy.cc
@@ -0,0 +1,135 @@
+/*  File produced by Kranc */
+
+#define KRANC_C
+
+#include <assert.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "cctk.h"
+#include "cctk_Arguments.h"
+#include "cctk_Parameters.h"
+#include "GenericFD.h"
+#include "Differencing.h"
+
+/* Define macros used in calculations */
+#define INITVALUE (42)
+#define QAD(x) (SQR(SQR(x)))
+#define INV(x) ((1.0) / (x))
+#define SQR(x) ((x) * (x))
+#define CUB(x) ((x) * (x) * (x))
+
+static void EM_energy_Body(cGH const * restrict const cctkGH, int const dir, int const face, CCTK_REAL const normal[3], CCTK_REAL const tangentA[3], CCTK_REAL const tangentB[3], int const min[3], int const max[3], int const n_subblock_gfs, CCTK_REAL * restrict const subblock_gfs[])
+{
+  DECLARE_CCTK_ARGUMENTS;
+  DECLARE_CCTK_PARAMETERS;
+  
+  
+  /* Declare the variables used for looping over grid points */
+  CCTK_INT i, j, k;
+  // CCTK_INT index = INITVALUE;
+  
+  /* Declare finite differencing variables */
+  
+  if (verbose > 1)
+  {
+    CCTK_VInfo(CCTK_THORNSTRING,"Entering EM_energy_Body");
+  }
+  
+  if (cctk_iteration % EM_energy_calc_every != EM_energy_calc_offset)
+  {
+    return;
+  }
+  
+  const char *groups[] = {"EM::B_group","EM::El_group","EM::endens"};
+  GenericFD_AssertGroupStorage(cctkGH, "EM_energy", 3, groups);
+  
+  
+  /* Include user-supplied include files */
+  
+  /* Initialise finite differencing variables */
+  ptrdiff_t const di = 1;
+  ptrdiff_t const dj = CCTK_GFINDEX3D(cctkGH,0,1,0) - CCTK_GFINDEX3D(cctkGH,0,0,0);
+  ptrdiff_t const dk = CCTK_GFINDEX3D(cctkGH,0,0,1) - CCTK_GFINDEX3D(cctkGH,0,0,0);
+  CCTK_REAL const dx = ToReal(CCTK_DELTA_SPACE(0));
+  CCTK_REAL const dy = ToReal(CCTK_DELTA_SPACE(1));
+  CCTK_REAL const dz = ToReal(CCTK_DELTA_SPACE(2));
+  CCTK_REAL const dt = ToReal(CCTK_DELTA_TIME);
+  CCTK_REAL const dxi = INV(dx);
+  CCTK_REAL const dyi = INV(dy);
+  CCTK_REAL const dzi = INV(dz);
+  CCTK_REAL const khalf = 0.5;
+  CCTK_REAL const kthird = 1/3.0;
+  CCTK_REAL const ktwothird = 2.0/3.0;
+  CCTK_REAL const kfourthird = 4.0/3.0;
+  CCTK_REAL const keightthird = 8.0/3.0;
+  CCTK_REAL const hdxi = 0.5 * dxi;
+  CCTK_REAL const hdyi = 0.5 * dyi;
+  CCTK_REAL const hdzi = 0.5 * dzi;
+  
+  /* Initialize predefined quantities */
+  CCTK_REAL const p1o1 = 1;
+  CCTK_REAL const p1o12dx = 0.0833333333333333333333333333333*INV(dx);
+  CCTK_REAL const p1o12dy = 0.0833333333333333333333333333333*INV(dy);
+  CCTK_REAL const p1o12dz = 0.0833333333333333333333333333333*INV(dz);
+  CCTK_REAL const p1o144dxdy = 0.00694444444444444444444444444444*INV(dx)*INV(dy);
+  CCTK_REAL const p1o144dxdz = 0.00694444444444444444444444444444*INV(dx)*INV(dz);
+  CCTK_REAL const p1o144dydz = 0.00694444444444444444444444444444*INV(dy)*INV(dz);
+  CCTK_REAL const p1o2dx = 0.5*INV(dx);
+  CCTK_REAL const p1o2dy = 0.5*INV(dy);
+  CCTK_REAL const p1o2dz = 0.5*INV(dz);
+  CCTK_REAL const p1o4dxdy = 0.25*INV(dx)*INV(dy);
+  CCTK_REAL const p1o4dxdz = 0.25*INV(dx)*INV(dz);
+  CCTK_REAL const p1o4dydz = 0.25*INV(dy)*INV(dz);
+  CCTK_REAL const p1odx = INV(dx);
+  CCTK_REAL const p1odx2 = INV(SQR(dx));
+  CCTK_REAL const p1ody = INV(dy);
+  CCTK_REAL const p1ody2 = INV(SQR(dy));
+  CCTK_REAL const p1odz = INV(dz);
+  CCTK_REAL const p1odz2 = INV(SQR(dz));
+  CCTK_REAL const pm1o12dx2 = -0.0833333333333333333333333333333*INV(SQR(dx));
+  CCTK_REAL const pm1o12dy2 = -0.0833333333333333333333333333333*INV(SQR(dy));
+  CCTK_REAL const pm1o12dz2 = -0.0833333333333333333333333333333*INV(SQR(dz));
+  
+  /* Loop over the grid points */
+  for (k = min[2]; k < max[2]; k++)
+  {
+    for (j = min[1]; j < max[1]; j++)
+    {
+      for (i = min[0]; i < max[0]; i++)
+      {
+         int  const  index  =  CCTK_GFINDEX3D(cctkGH,i,j,k) ;
+        
+        /* Assign local copies of grid functions */
+        
+        CCTK_REAL B1L = B1[index];
+        CCTK_REAL B2L = B2[index];
+        CCTK_REAL B3L = B3[index];
+        CCTK_REAL El1L = El1[index];
+        CCTK_REAL El2L = El2[index];
+        CCTK_REAL El3L = El3[index];
+        
+        
+        /* Include user supplied include files */
+        
+        /* Precompute derivatives */
+        
+        /* Calculate temporaries and grid functions */
+        CCTK_REAL rhoL = 0.5*(SQR(B1L) + SQR(B2L) + SQR(B3L) + SQR(El1L) + 
+          SQR(El2L) + SQR(El3L));
+        
+        /* Copy local copies back to grid functions */
+        rho[index] = rhoL;
+      }
+    }
+  }
+}
+
+extern "C" void EM_energy(CCTK_ARGUMENTS)
+{
+  DECLARE_CCTK_ARGUMENTS;
+  DECLARE_CCTK_PARAMETERS;
+  
+  GenericFD_LoopOverEverything(cctkGH, &EM_energy_Body);
+}
diff --git a/Examples/EM/src/EM_evol.cc b/Examples/EM/src/EM_evol.cc
new file mode 100644
index 0000000..311d5ca
--- /dev/null
+++ b/Examples/EM/src/EM_evol.cc
@@ -0,0 +1,162 @@
+/*  File produced by Kranc */
+
+#define KRANC_C
+
+#include <assert.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "cctk.h"
+#include "cctk_Arguments.h"
+#include "cctk_Parameters.h"
+#include "GenericFD.h"
+#include "Differencing.h"
+
+/* Define macros used in calculations */
+#define INITVALUE (42)
+#define QAD(x) (SQR(SQR(x)))
+#define INV(x) ((1.0) / (x))
+#define SQR(x) ((x) * (x))
+#define CUB(x) ((x) * (x) * (x))
+
+static void EM_evol_Body(cGH const * restrict const cctkGH, int const dir, int const face, CCTK_REAL const normal[3], CCTK_REAL const tangentA[3], CCTK_REAL const tangentB[3], int const min[3], int const max[3], int const n_subblock_gfs, CCTK_REAL * restrict const subblock_gfs[])
+{
+  DECLARE_CCTK_ARGUMENTS;
+  DECLARE_CCTK_PARAMETERS;
+  
+  
+  /* Declare the variables used for looping over grid points */
+  CCTK_INT i, j, k;
+  // CCTK_INT index = INITVALUE;
+  
+  /* Declare finite differencing variables */
+  
+  if (verbose > 1)
+  {
+    CCTK_VInfo(CCTK_THORNSTRING,"Entering EM_evol_Body");
+  }
+  
+  if (cctk_iteration % EM_evol_calc_every != EM_evol_calc_offset)
+  {
+    return;
+  }
+  
+  const char *groups[] = {"EM::B_group","EM::B_grouprhs","EM::El_group","EM::El_grouprhs"};
+  GenericFD_AssertGroupStorage(cctkGH, "EM_evol", 4, groups);
+  
+  GenericFD_EnsureStencilFits(cctkGH, "EM_evol", 1, 1, 1);
+  
+  /* Include user-supplied include files */
+  
+  /* Initialise finite differencing variables */
+  ptrdiff_t const di = 1;
+  ptrdiff_t const dj = CCTK_GFINDEX3D(cctkGH,0,1,0) - CCTK_GFINDEX3D(cctkGH,0,0,0);
+  ptrdiff_t const dk = CCTK_GFINDEX3D(cctkGH,0,0,1) - CCTK_GFINDEX3D(cctkGH,0,0,0);
+  CCTK_REAL const dx = ToReal(CCTK_DELTA_SPACE(0));
+  CCTK_REAL const dy = ToReal(CCTK_DELTA_SPACE(1));
+  CCTK_REAL const dz = ToReal(CCTK_DELTA_SPACE(2));
+  CCTK_REAL const dt = ToReal(CCTK_DELTA_TIME);
+  CCTK_REAL const dxi = INV(dx);
+  CCTK_REAL const dyi = INV(dy);
+  CCTK_REAL const dzi = INV(dz);
+  CCTK_REAL const khalf = 0.5;
+  CCTK_REAL const kthird = 1/3.0;
+  CCTK_REAL const ktwothird = 2.0/3.0;
+  CCTK_REAL const kfourthird = 4.0/3.0;
+  CCTK_REAL const keightthird = 8.0/3.0;
+  CCTK_REAL const hdxi = 0.5 * dxi;
+  CCTK_REAL const hdyi = 0.5 * dyi;
+  CCTK_REAL const hdzi = 0.5 * dzi;
+  
+  /* Initialize predefined quantities */
+  CCTK_REAL const p1o1 = 1;
+  CCTK_REAL const p1o12dx = 0.0833333333333333333333333333333*INV(dx);
+  CCTK_REAL const p1o12dy = 0.0833333333333333333333333333333*INV(dy);
+  CCTK_REAL const p1o12dz = 0.0833333333333333333333333333333*INV(dz);
+  CCTK_REAL const p1o144dxdy = 0.00694444444444444444444444444444*INV(dx)*INV(dy);
+  CCTK_REAL const p1o144dxdz = 0.00694444444444444444444444444444*INV(dx)*INV(dz);
+  CCTK_REAL const p1o144dydz = 0.00694444444444444444444444444444*INV(dy)*INV(dz);
+  CCTK_REAL const p1o2dx = 0.5*INV(dx);
+  CCTK_REAL const p1o2dy = 0.5*INV(dy);
+  CCTK_REAL const p1o2dz = 0.5*INV(dz);
+  CCTK_REAL const p1o4dxdy = 0.25*INV(dx)*INV(dy);
+  CCTK_REAL const p1o4dxdz = 0.25*INV(dx)*INV(dz);
+  CCTK_REAL const p1o4dydz = 0.25*INV(dy)*INV(dz);
+  CCTK_REAL const p1odx = INV(dx);
+  CCTK_REAL const p1odx2 = INV(SQR(dx));
+  CCTK_REAL const p1ody = INV(dy);
+  CCTK_REAL const p1ody2 = INV(SQR(dy));
+  CCTK_REAL const p1odz = INV(dz);
+  CCTK_REAL const p1odz2 = INV(SQR(dz));
+  CCTK_REAL const pm1o12dx2 = -0.0833333333333333333333333333333*INV(SQR(dx));
+  CCTK_REAL const pm1o12dy2 = -0.0833333333333333333333333333333*INV(SQR(dy));
+  CCTK_REAL const pm1o12dz2 = -0.0833333333333333333333333333333*INV(SQR(dz));
+  
+  /* Loop over the grid points */
+  for (k = min[2]; k < max[2]; k++)
+  {
+    for (j = min[1]; j < max[1]; j++)
+    {
+      for (i = min[0]; i < max[0]; i++)
+      {
+         int  const  index  =  CCTK_GFINDEX3D(cctkGH,i,j,k) ;
+        
+        /* Assign local copies of grid functions */
+        
+        CCTK_REAL B1L = B1[index];
+        CCTK_REAL B2L = B2[index];
+        CCTK_REAL B3L = B3[index];
+        CCTK_REAL El1L = El1[index];
+        CCTK_REAL El2L = El2[index];
+        CCTK_REAL El3L = El3[index];
+        
+        
+        /* Include user supplied include files */
+        
+        /* Precompute derivatives */
+        CCTK_REAL const PDstandard2nd2B1 = PDstandard2nd2(&B1[index]);
+        CCTK_REAL const PDstandard2nd3B1 = PDstandard2nd3(&B1[index]);
+        CCTK_REAL const PDstandard2nd1B2 = PDstandard2nd1(&B2[index]);
+        CCTK_REAL const PDstandard2nd3B2 = PDstandard2nd3(&B2[index]);
+        CCTK_REAL const PDstandard2nd1B3 = PDstandard2nd1(&B3[index]);
+        CCTK_REAL const PDstandard2nd2B3 = PDstandard2nd2(&B3[index]);
+        CCTK_REAL const PDstandard2nd2El1 = PDstandard2nd2(&El1[index]);
+        CCTK_REAL const PDstandard2nd3El1 = PDstandard2nd3(&El1[index]);
+        CCTK_REAL const PDstandard2nd1El2 = PDstandard2nd1(&El2[index]);
+        CCTK_REAL const PDstandard2nd3El2 = PDstandard2nd3(&El2[index]);
+        CCTK_REAL const PDstandard2nd1El3 = PDstandard2nd1(&El3[index]);
+        CCTK_REAL const PDstandard2nd2El3 = PDstandard2nd2(&El3[index]);
+        
+        /* Calculate temporaries and grid functions */
+        CCTK_REAL El1rhsL = PDstandard2nd2B3 - PDstandard2nd3B2;
+        
+        CCTK_REAL El2rhsL = -PDstandard2nd1B3 + PDstandard2nd3B1;
+        
+        CCTK_REAL El3rhsL = PDstandard2nd1B2 - PDstandard2nd2B1;
+        
+        CCTK_REAL B1rhsL = -PDstandard2nd2El3 + PDstandard2nd3El2;
+        
+        CCTK_REAL B2rhsL = PDstandard2nd1El3 - PDstandard2nd3El1;
+        
+        CCTK_REAL B3rhsL = -PDstandard2nd1El2 + PDstandard2nd2El1;
+        
+        /* Copy local copies back to grid functions */
+        B1rhs[index] = B1rhsL;
+        B2rhs[index] = B2rhsL;
+        B3rhs[index] = B3rhsL;
+        El1rhs[index] = El1rhsL;
+        El2rhs[index] = El2rhsL;
+        El3rhs[index] = El3rhsL;
+      }
+    }
+  }
+}
+
+extern "C" void EM_evol(CCTK_ARGUMENTS)
+{
+  DECLARE_CCTK_ARGUMENTS;
+  DECLARE_CCTK_PARAMETERS;
+  
+  GenericFD_LoopOverEverything(cctkGH, &EM_evol_Body);
+}
diff --git a/Examples/EM/src/EM_initial.cc b/Examples/EM/src/EM_initial.cc
new file mode 100644
index 0000000..9b2f83e
--- /dev/null
+++ b/Examples/EM/src/EM_initial.cc
@@ -0,0 +1,147 @@
+/*  File produced by Kranc */
+
+#define KRANC_C
+
+#include <assert.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "cctk.h"
+#include "cctk_Arguments.h"
+#include "cctk_Parameters.h"
+#include "GenericFD.h"
+#include "Differencing.h"
+
+/* Define macros used in calculations */
+#define INITVALUE (42)
+#define QAD(x) (SQR(SQR(x)))
+#define INV(x) ((1.0) / (x))
+#define SQR(x) ((x) * (x))
+#define CUB(x) ((x) * (x) * (x))
+
+static void EM_initial_Body(cGH const * restrict const cctkGH, int const dir, int const face, CCTK_REAL const normal[3], CCTK_REAL const tangentA[3], CCTK_REAL const tangentB[3], int const min[3], int const max[3], int const n_subblock_gfs, CCTK_REAL * restrict const subblock_gfs[])
+{
+  DECLARE_CCTK_ARGUMENTS;
+  DECLARE_CCTK_PARAMETERS;
+  
+  
+  /* Declare the variables used for looping over grid points */
+  CCTK_INT i, j, k;
+  // CCTK_INT index = INITVALUE;
+  
+  /* Declare finite differencing variables */
+  
+  if (verbose > 1)
+  {
+    CCTK_VInfo(CCTK_THORNSTRING,"Entering EM_initial_Body");
+  }
+  
+  if (cctk_iteration % EM_initial_calc_every != EM_initial_calc_offset)
+  {
+    return;
+  }
+  
+  const char *groups[] = {"EM::B_group","EM::El_group","grid::coordinates"};
+  GenericFD_AssertGroupStorage(cctkGH, "EM_initial", 3, groups);
+  
+  
+  /* Include user-supplied include files */
+  
+  /* Initialise finite differencing variables */
+  ptrdiff_t const di = 1;
+  ptrdiff_t const dj = CCTK_GFINDEX3D(cctkGH,0,1,0) - CCTK_GFINDEX3D(cctkGH,0,0,0);
+  ptrdiff_t const dk = CCTK_GFINDEX3D(cctkGH,0,0,1) - CCTK_GFINDEX3D(cctkGH,0,0,0);
+  CCTK_REAL const dx = ToReal(CCTK_DELTA_SPACE(0));
+  CCTK_REAL const dy = ToReal(CCTK_DELTA_SPACE(1));
+  CCTK_REAL const dz = ToReal(CCTK_DELTA_SPACE(2));
+  CCTK_REAL const dt = ToReal(CCTK_DELTA_TIME);
+  CCTK_REAL const dxi = INV(dx);
+  CCTK_REAL const dyi = INV(dy);
+  CCTK_REAL const dzi = INV(dz);
+  CCTK_REAL const khalf = 0.5;
+  CCTK_REAL const kthird = 1/3.0;
+  CCTK_REAL const ktwothird = 2.0/3.0;
+  CCTK_REAL const kfourthird = 4.0/3.0;
+  CCTK_REAL const keightthird = 8.0/3.0;
+  CCTK_REAL const hdxi = 0.5 * dxi;
+  CCTK_REAL const hdyi = 0.5 * dyi;
+  CCTK_REAL const hdzi = 0.5 * dzi;
+  
+  /* Initialize predefined quantities */
+  CCTK_REAL const p1o1 = 1;
+  CCTK_REAL const p1o12dx = 0.0833333333333333333333333333333*INV(dx);
+  CCTK_REAL const p1o12dy = 0.0833333333333333333333333333333*INV(dy);
+  CCTK_REAL const p1o12dz = 0.0833333333333333333333333333333*INV(dz);
+  CCTK_REAL const p1o144dxdy = 0.00694444444444444444444444444444*INV(dx)*INV(dy);
+  CCTK_REAL const p1o144dxdz = 0.00694444444444444444444444444444*INV(dx)*INV(dz);
+  CCTK_REAL const p1o144dydz = 0.00694444444444444444444444444444*INV(dy)*INV(dz);
+  CCTK_REAL const p1o2dx = 0.5*INV(dx);
+  CCTK_REAL const p1o2dy = 0.5*INV(dy);
+  CCTK_REAL const p1o2dz = 0.5*INV(dz);
+  CCTK_REAL const p1o4dxdy = 0.25*INV(dx)*INV(dy);
+  CCTK_REAL const p1o4dxdz = 0.25*INV(dx)*INV(dz);
+  CCTK_REAL const p1o4dydz = 0.25*INV(dy)*INV(dz);
+  CCTK_REAL const p1odx = INV(dx);
+  CCTK_REAL const p1odx2 = INV(SQR(dx));
+  CCTK_REAL const p1ody = INV(dy);
+  CCTK_REAL const p1ody2 = INV(SQR(dy));
+  CCTK_REAL const p1odz = INV(dz);
+  CCTK_REAL const p1odz2 = INV(SQR(dz));
+  CCTK_REAL const pm1o12dx2 = -0.0833333333333333333333333333333*INV(SQR(dx));
+  CCTK_REAL const pm1o12dy2 = -0.0833333333333333333333333333333*INV(SQR(dy));
+  CCTK_REAL const pm1o12dz2 = -0.0833333333333333333333333333333*INV(SQR(dz));
+  
+  /* Loop over the grid points */
+  for (k = min[2]; k < max[2]; k++)
+  {
+    for (j = min[1]; j < max[1]; j++)
+    {
+      for (i = min[0]; i < max[0]; i++)
+      {
+         int  const  index  =  CCTK_GFINDEX3D(cctkGH,i,j,k) ;
+        
+        /* Assign local copies of grid functions */
+        
+        CCTK_REAL xL = x[index];
+        CCTK_REAL yL = y[index];
+        
+        
+        /* Include user supplied include files */
+        
+        /* Precompute derivatives */
+        
+        /* Calculate temporaries and grid functions */
+        CCTK_REAL El1L = Cos(2*Pi*(xL + yL))*ToReal(sigma);
+        
+        CCTK_REAL El2L = Cos(2*Pi*xL)*(-1 + ToReal(sigma)) - Cos(2*Pi*(xL + 
+          yL))*ToReal(sigma);
+        
+        CCTK_REAL El3L = 0;
+        
+        CCTK_REAL B1L = 0;
+        
+        CCTK_REAL B2L = 0;
+        
+        CCTK_REAL B3L = -(Cos(2*Pi*xL)*(-1 + ToReal(sigma))) + Cos(2*Pi*(xL + 
+          yL))*ToReal(sigma);
+        
+        /* Copy local copies back to grid functions */
+        B1[index] = B1L;
+        B2[index] = B2L;
+        B3[index] = B3L;
+        El1[index] = El1L;
+        El2[index] = El2L;
+        El3[index] = El3L;
+      }
+    }
+  }
+}
+
+extern "C" void EM_initial(CCTK_ARGUMENTS)
+{
+  DECLARE_CCTK_ARGUMENTS;
+  DECLARE_CCTK_PARAMETERS;
+  
+  GenericFD_LoopOverEverything(cctkGH, &EM_initial_Body);
+}
diff --git a/Examples/EM/src/RegisterMoL.cc b/Examples/EM/src/RegisterMoL.cc
new file mode 100644
index 0000000..34583ae
--- /dev/null
+++ b/Examples/EM/src/RegisterMoL.cc
@@ -0,0 +1,22 @@
+/*  File produced by Kranc */
+
+#include "cctk.h"
+#include "cctk_Arguments.h"
+#include "cctk_Parameters.h"
+
+extern "C" void EM_RegisterVars(CCTK_ARGUMENTS)
+{
+  DECLARE_CCTK_ARGUMENTS;
+  DECLARE_CCTK_PARAMETERS;
+  
+  CCTK_INT ierr = 0;
+  
+  /* Register all the evolved grid functions with MoL */
+  ierr += MoLRegisterEvolved(CCTK_VarIndex("EM::B1"),  CCTK_VarIndex("EM::B1rhs"));
+  ierr += MoLRegisterEvolved(CCTK_VarIndex("EM::B2"),  CCTK_VarIndex("EM::B2rhs"));
+  ierr += MoLRegisterEvolved(CCTK_VarIndex("EM::B3"),  CCTK_VarIndex("EM::B3rhs"));
+  ierr += MoLRegisterEvolved(CCTK_VarIndex("EM::El1"),  CCTK_VarIndex("EM::El1rhs"));
+  ierr += MoLRegisterEvolved(CCTK_VarIndex("EM::El2"),  CCTK_VarIndex("EM::El2rhs"));
+  ierr += MoLRegisterEvolved(CCTK_VarIndex("EM::El3"),  CCTK_VarIndex("EM::El3rhs"));
+  return;
+}
diff --git a/Examples/EM/src/RegisterSymmetries.cc b/Examples/EM/src/RegisterSymmetries.cc
new file mode 100644
index 0000000..5854d6d
--- /dev/null
+++ b/Examples/EM/src/RegisterSymmetries.cc
@@ -0,0 +1,64 @@
+/*  File produced by Kranc */
+
+#include "cctk.h"
+#include "cctk_Arguments.h"
+#include "cctk_Parameters.h"
+#include "Symmetry.h"
+
+extern "C" void EM_RegisterSymmetries(CCTK_ARGUMENTS)
+{
+  DECLARE_CCTK_ARGUMENTS;
+  DECLARE_CCTK_PARAMETERS;
+  
+  
+  /* array holding symmetry definitions */
+  CCTK_INT sym[3];
+  
+  
+  /* Register symmetries of grid functions */
+  sym[0] = -1;
+  sym[1] = 1;
+  sym[2] = 1;
+  SetCartSymVN(cctkGH, sym, "EM::B1");
+  
+  sym[0] = 1;
+  sym[1] = -1;
+  sym[2] = 1;
+  SetCartSymVN(cctkGH, sym, "EM::B2");
+  
+  sym[0] = 1;
+  sym[1] = 1;
+  sym[2] = -1;
+  SetCartSymVN(cctkGH, sym, "EM::B3");
+  
+  sym[0] = -1;
+  sym[1] = 1;
+  sym[2] = 1;
+  SetCartSymVN(cctkGH, sym, "EM::El1");
+  
+  sym[0] = 1;
+  sym[1] = -1;
+  sym[2] = 1;
+  SetCartSymVN(cctkGH, sym, "EM::El2");
+  
+  sym[0] = 1;
+  sym[1] = 1;
+  sym[2] = -1;
+  SetCartSymVN(cctkGH, sym, "EM::El3");
+  
+  sym[0] = 1;
+  sym[1] = 1;
+  sym[2] = 1;
+  SetCartSymVN(cctkGH, sym, "EM::CEl");
+  
+  sym[0] = 1;
+  sym[1] = 1;
+  sym[2] = 1;
+  SetCartSymVN(cctkGH, sym, "EM::CB");
+  
+  sym[0] = 1;
+  sym[1] = 1;
+  sym[2] = 1;
+  SetCartSymVN(cctkGH, sym, "EM::rho");
+  
+}
diff --git a/Examples/EM/src/Startup.cc b/Examples/EM/src/Startup.cc
new file mode 100644
index 0000000..4375127
--- /dev/null
+++ b/Examples/EM/src/Startup.cc
@@ -0,0 +1,10 @@
+/*  File produced by Kranc */
+
+#include "cctk.h"
+
+extern "C" int EM_Startup(void)
+{
+  const char * banner = "EM";
+  CCTK_RegisterBanner(banner);
+  return 0;
+}
diff --git a/Examples/EM/src/make.code.defn b/Examples/EM/src/make.code.defn
new file mode 100644
index 0000000..0d52b41
--- /dev/null
+++ b/Examples/EM/src/make.code.defn
@@ -0,0 +1,3 @@
+# File produced by Kranc
+
+SRCS = Startup.cc RegisterMoL.cc RegisterSymmetries.cc EM_initial.cc EM_evol.cc EM_constraints.cc EM_energy.cc Boundaries.cc