static char help[] = "Tests loading DM vector from file.\n\n";

/*
    ex14.c writes out the DMDA and vector read by this program.
*/

#include <petscdmda.h>

int main(int argc, char **argv)
{
  PetscInt    M = PETSC_DECIDE, N = PETSC_DECIDE;
  DM          da;
  Vec         global;
  PetscViewer bviewer;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &argv, NULL, help));
  PetscCall(PetscOptionsGetInt(NULL, NULL, "-M", &M, NULL));
  PetscCall(PetscOptionsGetInt(NULL, NULL, "-N", &N, NULL));

  PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, "daoutput", FILE_MODE_READ, &bviewer));
  PetscCall(DMCreate(PETSC_COMM_WORLD, &da));

  PetscCall(DMLoad(da, bviewer));
  PetscCall(DMCreateGlobalVector(da, &global));
  PetscCall(VecLoad(global, bviewer));
  PetscCall(PetscViewerDestroy(&bviewer));

  PetscCall(VecView(global, PETSC_VIEWER_DRAW_WORLD));

  /* Free memory */
  PetscCall(VecDestroy(&global));
  PetscCall(DMDestroy(&da));
  PetscCall(PetscFinalize());
  return 0;
}