test_regrid_nan Subroutine

 subroutine test_regrid_nan(rc)
  integer, intent(out)  :: rc
  logical :: correct
  integer :: localrc
  type(ESMF_Grid) :: srcGrid
  type(ESMF_Grid) :: dstGrid
  type(ESMF_Field) :: srcField
  type(ESMF_Field) :: dstField
  type(ESMF_Array) :: srcArray
  type(ESMF_Array) :: dstArray
  type(ESMF_RouteHandle) :: routeHandle
  type(ESMF_ArraySpec) :: arrayspec
  type(ESMF_VM) :: vm
  real(ESMF_KIND_R8), pointer :: farrayPtr(:,:)
  integer :: clbnd(2),cubnd(2)
  integer :: i1,i2
  integer :: lDE, srclocalDECount, dstlocalDECount
  character(len=ESMF_MAXSTR) :: string
  integer src_nx, src_ny, dst_nx, dst_ny
  integer :: localPet, petCount

  ! result code
  integer :: finalrc

  ! init success flag
  correct=.true.

  rc=ESMF_SUCCESS

  ! get pet info
  call ESMF_VMGetGlobal(vm, rc=localrc)
  if (ESMF_LogFoundError(localrc, &
      ESMF_ERR_PASSTHRU, &
      ESMF_CONTEXT, rcToReturn=rc)) return
  call ESMF_VMGet(vm, petCount=petCount, localPet=localpet, rc=localrc)
  if (ESMF_LogFoundError(localrc, &
      ESMF_ERR_PASSTHRU, &
      ESMF_CONTEXT, rcToReturn=rc)) return

  ! Establish the resolution of the grids
  src_nx = 80
  src_ny = 80

  dst_nx = 70
  dst_ny = 70

  ! Create src and dst grids
  srcGrid=ESMF_GridCreate1PeriDimUfrm(maxIndex=(/src_nx,src_ny/), &
      minCornerCoord=(/0.0_ESMF_KIND_R8,-80.0_ESMF_KIND_R8/), &
      maxCornerCoord=(/360.0_ESMF_KIND_R8,80.0_ESMF_KIND_R8/), &
      staggerLocList=(/ESMF_STAGGERLOC_CENTER, ESMF_STAGGERLOC_CORNER/), &
      rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif
  dstGrid=ESMF_GridCreateNoPeriDimUfrm(maxIndex=(/dst_nx,dst_ny/), &
      minCornerCoord=(/-50.0_ESMF_KIND_R8,-50.0_ESMF_KIND_R8/), &
      maxCornerCoord=(/50.0_ESMF_KIND_R8,50.0_ESMF_KIND_R8/), &
      staggerLocList=(/ESMF_STAGGERLOC_CENTER, ESMF_STAGGERLOC_CORNER/), &
      rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif

  ! Create source/destination fields
  call ESMF_ArraySpecSet(arrayspec, 2, ESMF_TYPEKIND_R8, rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif
  srcField = ESMF_FieldCreate(srcGrid, arrayspec, &
      staggerloc=ESMF_STAGGERLOC_CENTER, name="source", rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif
  dstField = ESMF_FieldCreate(dstGrid, arrayspec, &
      staggerloc=ESMF_STAGGERLOC_CENTER, name="dest", rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif

  ! Get src and dst arrays
  call ESMF_FieldGet(dstField, array=dstArray, rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif
  call ESMF_FieldGet(srcField, array=srcArray, rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif

  ! Get number of local DEs
  call ESMF_GridGet(srcGrid, localDECount=srclocalDECount, rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif
  call ESMF_GridGet(dstGrid, localDECount=dstlocalDECount, rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif

  !!! Regrid forward from the A grid to the B grid
  ! Regrid store
  call ESMF_FieldRegridStore( &
      srcField, &
      dstField=dstField, &
      routeHandle=routeHandle, &
      regridmethod=ESMF_REGRIDMETHOD_BILINEAR, &
      rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif

  ! Test Regrid for Quiet NaN
  ! Fill src and dst fields
  call ESMF_FieldFill(srcField, dataFillScheme="nan", rc=rc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif
  call ESMF_FieldFill(dstField, dataFillScheme="one", rc=rc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif

  ! Do regrid nan
  call ESMF_FieldRegrid(srcField, dstField, routeHandle, rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif

  ! Check results for nan
  do lDE=0,dstlocalDECount-1

      call ESMF_FieldGet(dstField, lDE, farrayPtr, computationalLBound=clbnd, &
          computationalUBound=cubnd,  rc=localrc)
      if (localrc /=ESMF_SUCCESS) then
          rc=ESMF_FAILURE
          return
      endif

      do i1=clbnd(1),cubnd(1)
      do i2=clbnd(2),cubnd(2)

          if (.not. ieee_is_nan(farrayPtr(i1,i2))) then
              correct=.false.
          endif

      enddo
      enddo

  enddo    ! lDE

  ! Release the routehandle
  call ESMF_FieldRegridRelease(routeHandle, rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif

  ! Destroy the src and dst fields
  call ESMF_FieldDestroy(srcField, rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif
  call ESMF_FieldDestroy(dstField, rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif

  ! Free the src and dst grids
  call ESMF_GridDestroy(srcGrid, rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif
  call ESMF_GridDestroy(dstGrid, rc=localrc)
  if (localrc /=ESMF_SUCCESS) then
      rc=ESMF_FAILURE
      return
  endif

  ! return answer based on correct flag
  if (correct) then
      rc=ESMF_SUCCESS
  else
      rc=ESMF_FAILURE
  endif

 end subroutine test_regrid_nan