Actual source code: ex10.c


  2: static char help[] = "Tests ISFilter().\n\n";

  4: #include <petscis.h>
  5: #include <petscviewer.h>

  7: static PetscErrorCode CreateIS(MPI_Comm comm, PetscInt n, PetscInt first, PetscInt step, IS *is)
  8: {
  9:   PetscInt   *idx, i, j;
 10:   PetscMPIInt rank;

 12:   MPI_Comm_rank(comm, &rank);
 13:   *is = NULL;
 14:   first += rank;
 15:   PetscMalloc1(n, &idx);
 16:   for (i = 0, j = first; i < n; i++, j += step) idx[i] = j;
 17:   ISCreateGeneral(comm, n, idx, PETSC_OWN_POINTER, is);
 18:   return 0;
 19: }

 21: int main(int argc, char **argv)
 22: {
 23:   IS          is;
 24:   PetscInt    n = 10, N, first = 0, step = 0, start, end;
 25:   PetscMPIInt rank;
 26:   MPI_Comm    comm;

 29:   PetscInitialize(&argc, &argv, (char *)0, help);
 30:   comm = PETSC_COMM_WORLD;
 31:   MPI_Comm_rank(comm, &rank);
 32:   PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL);
 33:   PetscOptionsGetInt(NULL, NULL, "-first", &first, NULL);
 34:   PetscOptionsGetInt(NULL, NULL, "-step", &step, NULL);
 35:   start = 0;
 36:   end   = n;
 37:   PetscOptionsGetInt(NULL, NULL, "-start", &start, NULL);
 38:   PetscOptionsGetInt(NULL, NULL, "-end", &end, NULL);

 40:   CreateIS(comm, n, first, step, &is);
 41:   ISGeneralFilter(is, start, end);
 42:   ISView(is, PETSC_VIEWER_STDOUT_(comm));
 43:   ISGetSize(is, &N);
 44:   PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_(comm), "global size: %" PetscInt_FMT "\n", N);

 46:   ISDestroy(&is);
 47:   PetscFinalize();
 48:   return 0;
 49: }

 51: /*TEST

 53:     test:
 54:       suffix: 1
 55:       nsize: 4
 56:       args: -n 6
 57:       args: -first -2
 58:       args: -step 1
 59:       args: -start {{-2 4}separate output} -end {{2 6}separate output}

 61: TEST*/