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

#include <petscmat.h>

int main(int argc, char **argv)
{
  Mat         A, B;
  PetscMPIInt size;

  PetscCall(PetscInitialize(&argc, &argv, NULL, help));
  PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
  PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "This is a uniprocessor example only!");
  PetscCall(MatCreateSeqAIJ(PETSC_COMM_SELF, 2, 2, 2, NULL, &A));
  PetscCall(MatSetValue(A, 0, 0, 1.0, INSERT_VALUES));
  PetscCall(MatSetValue(A, 0, 1, 2.0, INSERT_VALUES));
  PetscCall(MatSetValue(A, 1, 1, 4.0, INSERT_VALUES));
  PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
  PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));
  PetscCall(MatView(A, PETSC_VIEWER_STDOUT_SELF));
  PetscCall(MatTranspose(A, MAT_INITIAL_MATRIX, &B));
  PetscCall(MatView(B, PETSC_VIEWER_STDOUT_SELF));
  PetscCall(MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE));
  PetscCall(MatSetValue(A, 1, 0, 3.0, INSERT_VALUES));
  PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
  PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));
  PetscCall(MatView(A, PETSC_VIEWER_STDOUT_SELF));
  PetscCall(MatTranspose(A, MAT_REUSE_MATRIX, &B));
  PetscCall(MatView(B, PETSC_VIEWER_STDOUT_SELF));
  PetscCall(MatDestroy(&A));
  PetscCall(MatDestroy(&B));
  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

   test:

TEST*/