1 2 #include <petscmat.h> 3 4 int main(int argc,char **argv) 5 { 6 Mat A, B; 7 const char *pfx; 8 9 CHKERRQ(PetscInitialize(&argc, &argv, NULL, NULL)); 10 CHKERRQ(MatCreate(PETSC_COMM_WORLD, &A)); 11 CHKERRQ(MatSetSizes(A, 1, 1, PETSC_DECIDE, PETSC_DECIDE)); 12 CHKERRQ(MatSetUp(A)); 13 CHKERRQ(MatSetOptionsPrefix(A, "foo_")); 14 CHKERRQ(MatGetDiagonalBlock(A, &B)); 15 /* Test set options prefix with the string obtained from get options prefix */ 16 CHKERRQ(PetscObjectGetOptionsPrefix((PetscObject)A,&pfx)); 17 CHKERRQ(MatSetOptionsPrefix(B, pfx)); 18 CHKERRQ(MatDestroy(&A)); 19 20 CHKERRQ(PetscFinalize()); 21 return 0; 22 } 23 24 /*TEST 25 26 test: 27 28 TEST*/ 29