Actual source code: ex56.c

  1: static char help[] = "Test the use of MatSetValuesBlocked(), MatZeroRows() for rectangular MatBAIJ matrix, test MatSetValuesBlocked() for MatSBAIJ matrix (-test_mat_sbaij).";

  3: #include <petscmat.h>

  5: int main(int argc, char **args)
  6: {
  7:   Mat         A;
  8:   PetscInt    bs = 3, m = 4, n = 6, i, j, val = 10, row[2], col[3], eval, rstart;
  9:   PetscMPIInt size, rank;
 10:   PetscScalar x[6][9], y[3][3], one = 1.0;
 11:   PetscBool   flg, testsbaij = PETSC_FALSE;

 13:   PetscFunctionBeginUser;
 14:   PetscCall(PetscInitialize(&argc, &args, NULL, help));
 15:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
 16:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));

 18:   PetscCall(PetscOptionsHasName(NULL, NULL, "-test_mat_sbaij", &testsbaij));

 20:   if (testsbaij) {
 21:     PetscCall(MatCreateSBAIJ(PETSC_COMM_WORLD, bs, m * bs, n * bs, PETSC_DECIDE, PETSC_DECIDE, 1, NULL, 1, NULL, &A));
 22:   } else {
 23:     PetscCall(MatCreateBAIJ(PETSC_COMM_WORLD, bs, m * bs, n * bs, PETSC_DECIDE, PETSC_DECIDE, 1, NULL, 1, NULL, &A));
 24:   }
 25:   PetscCall(MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE));
 26:   eval = 9;

 28:   PetscCall(PetscOptionsHasName(NULL, NULL, "-ass_extern", &flg));
 29:   if (flg && (size != 1)) rstart = m * ((rank + 1) % size);
 30:   else rstart = m * (rank);

 32:   row[0] = rstart + 0;
 33:   row[1] = rstart + 2;
 34:   col[0] = rstart + 0;
 35:   col[1] = rstart + 1;
 36:   col[2] = rstart + 3;
 37:   for (i = 0; i < 6; i++) {
 38:     for (j = 0; j < 9; j++) x[i][j] = (PetscScalar)val++;
 39:   }

 41:   PetscCall(MatSetValuesBlocked(A, 2, row, 3, col, &x[0][0], INSERT_VALUES));

 43:   PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
 44:   PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));

 46:   /*
 47:   This option does not work for rectangular matrices
 48:   PetscCall(MatSetOption(A,MAT_NEW_NONZERO_LOCATION_ERR,PETSC_TRUE));
 49:   */

 51:   PetscCall(MatSetValuesBlocked(A, 2, row, 3, col, &x[0][0], INSERT_VALUES));

 53:   /* Do another MatSetValues to test the case when only one local block is specified */
 54:   for (i = 0; i < 3; i++) {
 55:     for (j = 0; j < 3; j++) y[i][j] = (PetscScalar)(10 + i * eval + j);
 56:   }
 57:   PetscCall(MatSetValuesBlocked(A, 1, row, 1, col, &y[0][0], INSERT_VALUES));
 58:   PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
 59:   PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));

 61:   PetscCall(PetscOptionsHasName(NULL, NULL, "-zero_rows", &flg));
 62:   if (flg) {
 63:     col[0] = rstart * bs + 0;
 64:     col[1] = rstart * bs + 1;
 65:     col[2] = rstart * bs + 2;
 66:     PetscCall(MatZeroRows(A, 3, col, one, 0, 0));
 67:   }

 69:   PetscCall(MatView(A, PETSC_VIEWER_STDOUT_WORLD));

 71:   PetscCall(MatDestroy(&A));
 72:   PetscCall(PetscFinalize());
 73:   return 0;
 74: }

 76: /*TEST

 78:    test:
 79:       filter: grep -v " MPI process"

 81:    test:
 82:       suffix: 4
 83:       nsize: 3
 84:       args: -ass_extern
 85:       filter: grep -v " MPI process"

 87:    test:
 88:       suffix: 5
 89:       nsize: 3
 90:       args: -ass_extern -zero_rows
 91:       filter: grep -v " MPI process"

 93: TEST*/