Actual source code: ex179.c

  1: static char help[] = "Tests MatTranspose() with MAT_REUSE_MATRIX and different nonzero pattern\n\n";

  3: #include <petscmat.h>

  5: int main(int argc, char **argv)
  6: {
  7:   Mat         A, B;
  8:   PetscMPIInt size;

 10:   PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
 11:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
 12:   PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "This is a uniprocessor example only!");
 13:   PetscCall(MatCreateSeqAIJ(PETSC_COMM_SELF, 2, 2, 2, NULL, &A));
 14:   PetscCall(MatSetValue(A, 0, 0, 1.0, INSERT_VALUES));
 15:   PetscCall(MatSetValue(A, 0, 1, 2.0, INSERT_VALUES));
 16:   PetscCall(MatSetValue(A, 1, 1, 4.0, INSERT_VALUES));
 17:   PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
 18:   PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));
 19:   PetscCall(MatView(A, PETSC_VIEWER_STDOUT_SELF));
 20:   PetscCall(MatTranspose(A, MAT_INITIAL_MATRIX, &B));
 21:   PetscCall(MatView(B, PETSC_VIEWER_STDOUT_SELF));
 22:   PetscCall(MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE));
 23:   PetscCall(MatSetValue(A, 1, 0, 3.0, INSERT_VALUES));
 24:   PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
 25:   PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));
 26:   PetscCall(MatView(A, PETSC_VIEWER_STDOUT_SELF));
 27:   PetscCall(MatTranspose(A, MAT_REUSE_MATRIX, &B));
 28:   PetscCall(MatView(B, PETSC_VIEWER_STDOUT_SELF));
 29:   PetscCall(MatDestroy(&A));
 30:   PetscCall(MatDestroy(&B));
 31:   PetscCall(PetscFinalize());
 32:   return 0;
 33: }

 35: /*TEST

 37:    test:

 39: TEST*/