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 CHKERRQ(MatCreate(PETSC_COMM_WORLD, &A)); 12 CHKERRQ(MatSetSizes(A, 1, 1, PETSC_DECIDE, PETSC_DECIDE)); 13 CHKERRQ(MatSetUp(A)); 14 CHKERRQ(MatSetOptionsPrefix(A, "foo_")); 15 CHKERRQ(MatGetDiagonalBlock(A, &B)); 16 /* Test set options prefix with the string obtained from get options prefix */ 17 CHKERRQ(PetscObjectGetOptionsPrefix((PetscObject)A,&pfx)); 18 CHKERRQ(MatSetOptionsPrefix(B, pfx)); 19 CHKERRQ(MatDestroy(&A)); 20 21 ierr = PetscFinalize(); 22 return ierr; 23 } 24 25 /*TEST 26 27 test: 28 29 TEST*/ 30