1 2 #include <petscmat.h> 3 4 int main(int argc,char **argv) 5 { 6 PetscErrorCode ierr; 7 Mat A, B; 8 const char *pfx; 9 10 ierr = PetscInitialize(&argc, &argv, NULL, NULL);if (ierr) return ierr; 11 ierr = MatCreate(PETSC_COMM_WORLD, &A);CHKERRQ(ierr); 12 ierr = MatSetSizes(A, 1, 1, PETSC_DECIDE, PETSC_DECIDE);CHKERRQ(ierr); 13 ierr = MatSetUp(A);CHKERRQ(ierr); 14 ierr = MatSetOptionsPrefix(A, "foo_");CHKERRQ(ierr); 15 ierr = MatGetDiagonalBlock(A, &B);CHKERRQ(ierr); 16 /* Test set options prefix with the string obtained from get options prefix */ 17 ierr = PetscObjectGetOptionsPrefix((PetscObject)A,&pfx);CHKERRQ(ierr); 18 ierr = MatSetOptionsPrefix(B, pfx);CHKERRQ(ierr); 19 ierr = MatDestroy(&A); CHKERRQ(ierr); 20 21 ierr = PetscFinalize(); 22 return ierr; 23 } 24 25 /*TEST 26 27 test: 28 29 TEST*/ 30