1 2 static char help[] = "Tests MatTranspose() with MAT_REUSE_MATRIX and different nonzero pattern\n\n"; 3 4 #include <petscmat.h> 5 6 int main(int argc, char **argv) 7 { 8 Mat A, B; 9 PetscMPIInt size; 10 11 PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 12 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 13 PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "This is a uniprocessor example only!"); 14 PetscCall(MatCreateSeqAIJ(PETSC_COMM_SELF, 2, 2, 2, NULL, &A)); 15 PetscCall(MatSetValue(A, 0, 0, 1.0, INSERT_VALUES)); 16 PetscCall(MatSetValue(A, 0, 1, 2.0, INSERT_VALUES)); 17 PetscCall(MatSetValue(A, 1, 1, 4.0, INSERT_VALUES)); 18 PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY)); 19 PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY)); 20 PetscCall(MatView(A, PETSC_VIEWER_STDOUT_SELF)); 21 PetscCall(MatTranspose(A, MAT_INITIAL_MATRIX, &B)); 22 PetscCall(MatView(B, PETSC_VIEWER_STDOUT_SELF)); 23 PetscCall(MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE)); 24 PetscCall(MatSetValue(A, 1, 0, 3.0, INSERT_VALUES)); 25 PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY)); 26 PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY)); 27 PetscCall(MatView(A, PETSC_VIEWER_STDOUT_SELF)); 28 PetscCall(MatTranspose(A, MAT_REUSE_MATRIX, &B)); 29 PetscCall(MatView(B, PETSC_VIEWER_STDOUT_SELF)); 30 PetscCall(MatDestroy(&A)); 31 PetscCall(MatDestroy(&B)); 32 PetscCall(PetscFinalize()); 33 return 0; 34 } 35 36 /*TEST 37 38 test: 39 40 TEST*/ 41