Actual source code: ex131.c


  2: static char help[] = "Tests MatMult() on MatLoad() matrix \n\n";

  4: #include <petscmat.h>

  6: int main(int argc, char **args)
  7: {
  8:   Mat         A;
  9:   Vec         x, b;
 10:   PetscViewer fd;                       /* viewer */
 11:   char        file[PETSC_MAX_PATH_LEN]; /* input file name */
 12:   PetscBool   flg;

 15:   PetscInitialize(&argc, &args, (char *)0, help);
 16:   /* Determine file from which we read the matrix A */
 17:   PetscOptionsGetString(NULL, NULL, "-f", file, sizeof(file), &flg);

 20:   /* Load matrix A */
 21:   PetscViewerBinaryOpen(PETSC_COMM_WORLD, file, FILE_MODE_READ, &fd);
 22:   MatCreate(PETSC_COMM_WORLD, &A);
 23:   MatLoad(A, fd);
 24:   flg = PETSC_FALSE;
 25:   VecCreate(PETSC_COMM_WORLD, &x);
 26:   PetscOptionsGetString(NULL, NULL, "-vec", file, sizeof(file), &flg);
 27:   if (flg) {
 28:     if (file[0] == '0') {
 29:       PetscInt    m;
 30:       PetscScalar one = 1.0;
 31:       PetscInfo(0, "Using vector of ones for RHS\n");
 32:       MatGetLocalSize(A, &m, NULL);
 33:       VecSetSizes(x, m, PETSC_DECIDE);
 34:       VecSetFromOptions(x);
 35:       VecSet(x, one);
 36:     }
 37:   } else {
 38:     VecLoad(x, fd);
 39:     PetscViewerDestroy(&fd);
 40:   }
 41:   VecDuplicate(x, &b);
 42:   MatMult(A, x, b);

 44:   /* Print (for testing only) */
 45:   MatView(A, 0);
 46:   VecView(b, 0);
 47:   /* Free data structures */
 48:   MatDestroy(&A);
 49:   VecDestroy(&x);
 50:   VecDestroy(&b);
 51:   PetscFinalize();
 52:   return 0;
 53: }