From 93d997291d78ca3cebf36f33673b75ffcd8a4ba6 Mon Sep 17 00:00:00 2001
From: diener <diener@f69c4107-0314-4c4f-9ad4-17e986b73f4a>
Date: Thu, 18 Oct 2007 13:35:10 +0000
Subject: Make 2nd derivative interface consistent with FiniteDifferencing and
 FourierDifferencing, providing a routine to return mixed derivatives obtained
  by applying two succesive 1st derivatives in different directions. Not
 tested yet, but compiles.

git-svn-id: https://svn.cct.lsu.edu/repos/numrel/LSUThorns/SummationByParts/trunk@87 f69c4107-0314-4c4f-9ad4-17e986b73f4a
---
 interface.ccl              |  3 ++-
 src/Derivatives2_mixed.F90 | 29 +++++++++++++++++++++++++++++
 src/call_derivs2.c         | 22 +++++++++++++++++++---
 src/make.code.defn         |  1 +
 4 files changed, 51 insertions(+), 4 deletions(-)
 create mode 100644 src/Derivatives2_mixed.F90

diff --git a/interface.ccl b/interface.ccl
index a9f203d..02614a6 100644
--- a/interface.ccl
+++ b/interface.ccl
@@ -26,7 +26,8 @@ SUBROUTINE Diff_up_gv ( CCTK_POINTER_TO_CONST IN cctkGH, \
 PROVIDES FUNCTION Diff_up_gv WITH DiffUpGv LANGUAGE C
 
 SUBROUTINE Diff2_gv ( CCTK_POINTER_TO_CONST IN cctkGH, \
-                     CCTK_INT IN dir, \
+                     CCTK_INT IN dir1, \
+                     CCTK_INT IN dir2, \
                      CCTK_REAL IN ARRAY var, \
                      CCTK_REAL OUT ARRAY dvar, \
                      CCTK_INT IN table_handle )
diff --git a/src/Derivatives2_mixed.F90 b/src/Derivatives2_mixed.F90
new file mode 100644
index 0000000..7c9e644
--- /dev/null
+++ b/src/Derivatives2_mixed.F90
@@ -0,0 +1,29 @@
+#include "cctk.h"
+#include "cctk_Functions.h"
+#include "cctk_Parameters.h"
+
+
+subroutine deriv2_mixed ( cctkGH, dir1, dir2, var, ni, nj, nk, &
+                                              dvar2, table_handle )
+
+  implicit none
+
+  DECLARE_CCTK_FUNCTIONS
+  DECLARE_CCTK_PARAMETERS
+
+  CCTK_POINTER, intent(IN) :: cctkGH
+  CCTK_INT, intent(IN) :: dir1, dir2
+  CCTK_REAL, dimension(ni,nj,nk), intent(IN) :: var
+  CCTK_INT, intent(IN) :: ni, nj, nk
+  CCTK_REAL, dimension(ni,nj,nk), intent(OUT) :: dvar2
+  CCTK_INT, intent(IN) :: table_handle
+  CCTK_REAL, dimension(:,:,:), allocatable :: tmp
+
+  allocate ( tmp(ni,nj,nk) )
+
+  call Diff_gv ( cctkGH, dir1, var, tmp, table_handle)
+  call Diff_gv ( cctkGH, dir2, tmp, dvar2, table_handle )
+
+  deallocate ( tmp )
+
+end subroutine deriv2_mixed
diff --git a/src/call_derivs2.c b/src/call_derivs2.c
index cf193c6..5ec2100 100644
--- a/src/call_derivs2.c
+++ b/src/call_derivs2.c
@@ -9,15 +9,15 @@
 
 
 
-void DiffGv2 ( const CCTK_POINTER_TO_CONST cctkGH_, const CCTK_INT dir,
-               const CCTK_REAL *var, CCTK_REAL *dvar2,
+void DiffGv2 ( const CCTK_POINTER_TO_CONST cctkGH_, const CCTK_INT dir1,
+               const CCTK_INT dir2, const CCTK_REAL *var, CCTK_REAL *dvar2,
                const CCTK_INT table_handle )
 {
   cGH const * restrict const cctkGH = cctkGH_;
   DECLARE_CCTK_PARAMETERS
   DECLARE_CCTK_ARGUMENTS
 
-  CCTK_INT ni, nj, nk, gsize, loc_order;
+  CCTK_INT ni, nj, nk, gsize, loc_order, dir;
   CCTK_REAL delta;
   CCTK_INT bb[2];
   int onesided[6];
@@ -50,10 +50,26 @@ void DiffGv2 ( const CCTK_POINTER_TO_CONST cctkGH_, const CCTK_INT dir,
                                        const CCTK_INT *gsize,
                                        const CCTK_REAL *delta,
                                        CCTK_REAL *dvar2);
+  void CCTK_FCALL CCTK_FNAME(deriv2_mixed)(const CCTK_POINTER_TO_CONST *cctkGH,
+                                       const CCTK_INT *dir1,
+                                       const CCTK_INT *dir2,
+                                       const CCTK_REAL *var,
+                                       const CCTK_INT *ni,
+                                       const CCTK_INT *nj,
+                                       const CCTK_INT *nk,
+                                       CCTK_REAL *dvar2,
+                                       const CCTK_INT *table_handle);
 
   
   ni = cctk_lsh[0]; nj = cctk_lsh[1]; nk = cctk_lsh[2];
  
+  if ( dir1 != dir2 ) {
+    CCTK_FNAME(deriv2_mixed)(&cctkGH_,&dir1,&dir2,var,&ni,&nk,&nk,dvar2,&table_handle);
+    return;
+  } else {
+    dir = dir1;
+  }
+
   if ( table_handle >=0 ) {
     nelements = Util_TableGetInt ( table_handle, &loc_order, "order" );
     if ( nelements == UTIL_ERROR_TABLE_NO_SUCH_KEY ) {
diff --git a/src/make.code.defn b/src/make.code.defn
index 4357264..7c20a83 100644
--- a/src/make.code.defn
+++ b/src/make.code.defn
@@ -20,6 +20,7 @@ SRCS =  call_derivs.c \
         Derivatives_4_3_min_err_coeff.F90 \
         Derivatives_6_5.F90 \
         Derivatives_6_5_min_err_coeff.F90 \
+        Derivatives2_mixed.F90 \
         Get_Coeff.F90 \
         set_norm_mask.F90 \
         GetScalProdDiag.F90 \
-- 
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