Actual source code: ex122.c

  1: static char help[] = "Test MatMatMult() for AIJ and Dense matrices.\n\n";

  3: #include <petscmat.h>

  5: int main(int argc, char **argv)
  6: {
  7:   Mat         A, B, C;
  8:   PetscInt    M = 10, N = 5;
  9:   PetscRandom r;
 10:   PetscBool   equal = PETSC_FALSE;
 11:   PetscReal   fill  = 1.0;
 12:   PetscInt    nza, am, an;

 15:   PetscInitialize(&argc, &argv, (char *)0, help);
 16:   PetscOptionsGetInt(NULL, NULL, "-M", &M, NULL);
 17:   PetscOptionsGetInt(NULL, NULL, "-N", &N, NULL);
 18:   PetscOptionsGetReal(NULL, NULL, "-fill", &fill, NULL);

 20:   PetscRandomCreate(PETSC_COMM_WORLD, &r);
 21:   PetscRandomSetFromOptions(r);

 23:   /* create a aij matrix A */
 24:   MatCreate(PETSC_COMM_WORLD, &A);
 25:   MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, N, M);
 26:   MatSetType(A, MATAIJ);
 27:   nza = (PetscInt)(.3 * M); /* num of nozeros in each row of A */
 28:   MatSeqAIJSetPreallocation(A, nza, NULL);
 29:   MatMPIAIJSetPreallocation(A, nza, NULL, nza, NULL);
 30:   MatSetRandom(A, r);

 32:   /* create a dense matrix B */
 33:   MatGetLocalSize(A, &am, &an);
 34:   MatCreate(PETSC_COMM_WORLD, &B);
 35:   MatSetSizes(B, PETSC_DECIDE, am, N, PETSC_DECIDE);
 36:   MatSetType(B, MATDENSE);
 37:   MatSeqDenseSetPreallocation(B, NULL);
 38:   MatMPIDenseSetPreallocation(B, NULL);
 39:   MatSetRandom(B, r);
 40:   PetscRandomDestroy(&r);

 42:   /* Test MatMatMult() */
 43:   MatMatMult(B, A, MAT_INITIAL_MATRIX, fill, &C);
 44:   MatMatMult(B, A, MAT_REUSE_MATRIX, fill, &C);
 45:   MatMatMultEqual(B, A, C, 10, &equal);

 48:   MatDestroy(&C);
 49:   MatDestroy(&B);
 50:   MatDestroy(&A);
 51:   PetscFinalize();
 52:   return 0;
 53: }

 55: /*TEST

 57:    test:
 58:       output_file: output/ex122.out

 60: TEST*/