1 static char help[] = "Test MatSetRandom on MATMPIAIJ matrices\n\n"; 2 3 /* 4 Adapted from an example Contributed-by: Jakub Kruzik <jakub.kruzik@vsb.cz> 5 */ 6 #include <petscmat.h> 7 int main(int argc, char **args) { 8 Mat A[2]; 9 PetscReal nrm, tol = 10 * PETSC_SMALL; 10 PetscRandom rctx; 11 12 PetscFunctionBeginUser; 13 PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 14 PetscCall(PetscRandomCreate(PETSC_COMM_WORLD, &rctx)); 15 16 /* Call MatSetRandom on unassembled matrices */ 17 PetscCall(MatCreateAIJ(PETSC_COMM_WORLD, PETSC_DECIDE, PETSC_DECIDE, 20, 20, 3, NULL, 3, NULL, &A[0])); 18 PetscCall(MatCreateAIJ(PETSC_COMM_WORLD, PETSC_DECIDE, PETSC_DECIDE, 20, 20, 3, NULL, 3, NULL, &A[1])); 19 PetscCall(MatSetRandom(A[0], rctx)); 20 PetscCall(MatSetRandom(A[1], rctx)); 21 22 PetscCall(MatAXPY(A[0], 1.0, A[1], DIFFERENT_NONZERO_PATTERN)); 23 PetscCall(MatAXPY(A[0], -1.0, A[0], SAME_NONZERO_PATTERN)); 24 PetscCall(MatNorm(A[0], NORM_1, &nrm)); 25 if (nrm > tol) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Error: MatNorm(), norm1=: %g\n", (double)nrm)); 26 27 /* Call MatSetRandom on assembled matrices */ 28 PetscCall(MatSetRandom(A[0], rctx)); 29 PetscCall(MatSetRandom(A[1], rctx)); 30 31 PetscCall(MatAXPY(A[0], 1.0, A[1], DIFFERENT_NONZERO_PATTERN)); 32 PetscCall(MatAXPY(A[0], -1.0, A[0], SAME_NONZERO_PATTERN)); 33 PetscCall(MatNorm(A[0], NORM_1, &nrm)); 34 if (nrm > tol) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Error: MatNorm(), norm1=: %g\n", (double)nrm)); 35 36 PetscCall(MatDestroy(&A[0])); 37 PetscCall(MatDestroy(&A[1])); 38 PetscCall(PetscRandomDestroy(&rctx)); 39 PetscCall(PetscFinalize()); 40 return 0; 41 } 42 43 /*TEST 44 test: 45 nsize: 3 46 TEST*/ 47