static char help[] = "Test the use of MatSetValuesBlocked(), MatZeroRows() for rectangular MatBAIJ matrix, test MatSetValuesBlocked() for MatSBAIJ matrix (-test_mat_sbaij).";

#include <petscmat.h>

int main(int argc,char **args)
{
  Mat            A;
  PetscInt       bs=3,m=4,n=6,i,j,val = 10,row[2],col[3],eval,rstart;
  PetscMPIInt    size,rank;
  PetscScalar    x[6][9],y[3][3],one=1.0;
  PetscBool      flg,testsbaij=PETSC_FALSE;

  PetscCall(PetscInitialize(&argc,&args,(char*)0,help));
  PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size));
  PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank));

  PetscCall(PetscOptionsHasName(NULL,NULL,"-test_mat_sbaij",&testsbaij));

  if (testsbaij) {
    PetscCall(MatCreateSBAIJ(PETSC_COMM_WORLD,bs,m*bs,n*bs,PETSC_DECIDE,PETSC_DECIDE,1,NULL,1,NULL,&A));
  } else {
    PetscCall(MatCreateBAIJ(PETSC_COMM_WORLD,bs,m*bs,n*bs,PETSC_DECIDE,PETSC_DECIDE,1,NULL,1,NULL,&A));
  }
  PetscCall(MatSetOption(A,MAT_NEW_NONZERO_ALLOCATION_ERR,PETSC_FALSE));
  eval = 9;

  PetscCall(PetscOptionsHasName(NULL,NULL,"-ass_extern",&flg));
  if (flg && (size != 1)) rstart = m*((rank+1)%size);
  else rstart = m*(rank);

  row[0] =rstart+0;  row[1] =rstart+2;
  col[0] =rstart+0;  col[1] =rstart+1;  col[2] =rstart+3;
  for (i=0; i<6; i++) {
    for (j =0; j< 9; j++) x[i][j] = (PetscScalar)val++;
  }

  PetscCall(MatSetValuesBlocked(A,2,row,3,col,&x[0][0],INSERT_VALUES));

  PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
  PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));

  /*
  This option does not work for rectangular matrices
  PetscCall(MatSetOption(A,MAT_NEW_NONZERO_LOCATION_ERR,PETSC_TRUE));
  */

  PetscCall(MatSetValuesBlocked(A,2,row,3,col,&x[0][0],INSERT_VALUES));

  /* Do another MatSetValues to test the case when only one local block is specified */
  for (i=0; i<3; i++) {
    for (j =0; j<3; j++) y[i][j] = (PetscScalar)(10 + i*eval + j);
  }
  PetscCall(MatSetValuesBlocked(A,1,row,1,col,&y[0][0],INSERT_VALUES));
  PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
  PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));

  PetscCall(PetscOptionsHasName(NULL,NULL,"-zero_rows",&flg));
  if (flg) {
    col[0] = rstart*bs+0;
    col[1] = rstart*bs+1;
    col[2] = rstart*bs+2;
    PetscCall(MatZeroRows(A,3,col,one,0,0));
  }

  PetscCall(MatView(A,PETSC_VIEWER_STDOUT_WORLD));

  PetscCall(MatDestroy(&A));
  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

   test:
      filter: grep -v " MPI process"

   test:
      suffix: 4
      nsize: 3
      args: -ass_extern
      filter: grep -v " MPI process"

   test:
      suffix: 5
      nsize: 3
      args: -ass_extern -zero_rows
      filter: grep -v " MPI process"

TEST*/