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#include "confdefs.h"
program test_differentiate_field
use fields
use field_derivatives
use state_module
use vtk_interfaces
use unittest_tools
type(state_type) :: state
type(mesh_type), pointer :: mesh
type(vector_field), pointer :: positions
type(scalar_field), pointer :: field
type(vector_field) :: gradfield
character(len=256) :: filename, fieldname
logical :: allocated
#ifdef HAVE_MPI
integer :: ierr
call MPI_Init(ierr)
#endif
call read_command_line(filename, fieldname)
call vtk_read_state(trim(filename), state)
mesh => extract_mesh(state, "Mesh")
positions => extract_vector_field(state, "Coordinate")
field => extract_scalar_field(state, trim(fieldname), allocated=allocated)
call allocate(gradfield, 3, mesh, "Gradient" // trim(fieldname))
call grad(field, positions, gradfield)
call insert(state, gradfield, "Gradient" // trim(fieldname))
call vtk_write_state(filename(1:len_trim(filename)-4), 0, state=(/state/))
#ifdef HAVE_MPI
call MPI_Finalize
#endif
end program test_differentiate_field
subroutine read_command_line(filename, field)
! Read the input filename & field from the command
! line.
character(len=*), intent(out) :: filename, field
integer :: status
call get_command_argument(1, value=filename, status=status)
select case(status)
case(1:)
call usage
stop
case(:-1)
write(0,*) "Warning: truncating filename"
end select
call get_command_argument(2, value=field, status=status)
select case(status)
case(1:)
! No field specified.
call usage
stop
case(:-1)
write(0,*) "Warning: truncating field"
end select
end subroutine read_command_line
subroutine usage
write (0,*) "usage: differentiate <vtu_file> <field>"
end subroutine usage
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