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/*@@
@routine FortranSym
@date Mon Mar 15 15:51:57 1999
@author Gerd Lanfermann
@desc
Routine performs the symmetry boundary operations.
@enddesc
@calls
@calledby
@history
@endhistory
@@*/
subroutine FortranSym(nxyz,var,nghostzones,sym,doSym)
implicit none
INTEGER nxyz(3)
CCTK_REAL var(nxyz(1),nxyz(2),nxyz(3))
INTEGER nghostzones
INTEGER sym(3)
INTEGER doSym(3)
INTEGER sw
c Apply symmetry if
c * the grid chunk has a physical boundary (bbox)
c * its size in a direction is bigger than one (sh)
c * we actually want a symmetry (sx.ne.ESYM_UNSET)
if (doSym(1) == 1) then
do sw=1, nghostzones
var(sw,:,:) = sym(1)*var(nghostzones+sw,:,:)
end do
end if
if (doSym(2) == 1) then
do sw=1, nghostzones
var(:,sw,:) = sym(2)*var(:,nghostzones+sw,:)
end do
end if
if (doSym(3).eq.1) then
do sw=1, nghostzones
var(:,:,sw) = sym(3)*var(:,:,nghostzones+sw)
end do
end if
end subroutine
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