static char help[] = "Test MatSetRandom on MATMPIAIJ matrices\n\n";

/*
   Adapted from an example Contributed-by: Jakub Kruzik <jakub.kruzik@vsb.cz>
*/
#include <petscmat.h>
int main(int argc, char **args)
{
  Mat         A[2];
  PetscReal   nrm, tol = 10 * PETSC_SMALL;
  PetscRandom rctx;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &args, NULL, help));
  PetscCall(PetscRandomCreate(PETSC_COMM_WORLD, &rctx));

  /* Call MatSetRandom on unassembled matrices */
  PetscCall(MatCreateAIJ(PETSC_COMM_WORLD, PETSC_DECIDE, PETSC_DECIDE, 20, 20, 3, NULL, 3, NULL, &A[0]));
  PetscCall(MatCreateAIJ(PETSC_COMM_WORLD, PETSC_DECIDE, PETSC_DECIDE, 20, 20, 3, NULL, 3, NULL, &A[1]));
  PetscCall(MatSetRandom(A[0], rctx));
  PetscCall(MatSetRandom(A[1], rctx));

  PetscCall(MatAXPY(A[0], 1.0, A[1], DIFFERENT_NONZERO_PATTERN));
  PetscCall(MatAXPY(A[0], -1.0, A[0], SAME_NONZERO_PATTERN));
  PetscCall(MatNorm(A[0], NORM_1, &nrm));
  if (nrm > tol) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Error: MatNorm(), norm1=: %g\n", (double)nrm));

  /* Call MatSetRandom on assembled matrices */
  PetscCall(MatSetRandom(A[0], rctx));
  PetscCall(MatSetRandom(A[1], rctx));

  PetscCall(MatAXPY(A[0], 1.0, A[1], DIFFERENT_NONZERO_PATTERN));
  PetscCall(MatAXPY(A[0], -1.0, A[0], SAME_NONZERO_PATTERN));
  PetscCall(MatNorm(A[0], NORM_1, &nrm));
  if (nrm > tol) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Error: MatNorm(), norm1=: %g\n", (double)nrm));

  PetscCall(MatDestroy(&A[0]));
  PetscCall(MatDestroy(&A[1]));
  PetscCall(PetscRandomDestroy(&rctx));
  PetscCall(PetscFinalize());
  return 0;
}

/*TEST
   test:
      nsize: 3
      output_file: output/empty.out
TEST*/