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#include "cctk.h"
#include "cctk_Functions.h"
#include "cctk_Parameters.h"
subroutine set_coeff_2_1 ( nsize, loc_order, bb, gsize, imin, imax, dd )
implicit none
DECLARE_CCTK_FUNCTIONS
DECLARE_CCTK_PARAMETERS
CCTK_REAL, parameter :: zero = 0.0
integer, parameter :: wp = kind(zero)
CCTK_INT, intent(IN) :: nsize, loc_order
CCTK_INT, dimension(2), intent(IN) :: bb
CCTK_INT, intent(IN) :: gsize
CCTK_INT, dimension(nsize), intent(OUT) :: imin, imax
CCTK_REAL, dimension(nsize,nsize), intent(OUT) :: dd
CCTK_REAL, dimension(1), save :: a
CCTK_REAL, dimension(3,2), save :: q
CCTK_INT :: i, il, ir
logical, save :: first = .true.
if ( first ) then
a(1) = 1.0_wp/2.0_wp
q(1,1) = -1.0_wp; q(2,1) = 1.0_wp; q(3,1) = zero
q(1,2) = -1.0_wp/2.0_wp; q(2,2) = zero; q(3,2) = 1.0_wp/2.0_wp
first = .false.
end if
dd = zero
imin = 0
imax = -1
if ( bb(1) == 0 ) then
il = 1 + gsize
else
dd(1,1) = q(1,1); dd(2,1) = q(2,1)
imin(1) = 1; imax(1) = 2
dd(1,2) = q(1,2); dd(3,2) = q(3,2)
imin(2) = 1; imax(2) = 3
il = 3
end if
if ( bb(2) == 0 ) then
ir = nsize - gsize
else
dd(nsize-2,nsize-1) = -q(3,2); dd(nsize,nsize-1) = -q(1,2)
imin(nsize-1) = nsize-2; imax(nsize-1) = nsize
dd(nsize-1,nsize) = -q(2,1); dd(nsize,nsize) = -q(1,1)
imin(nsize) = nsize-1; imax(nsize) = nsize
ir = nsize - 2
end if
do i = il, ir
dd(i-1,i) = -a(1); dd(i+1,i) = a(1)
imin(i) = i-1; imax(i) = i+1
end do
end subroutine set_coeff_2_1
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