static char help[] = "Test MatCreateRedundantMatrix for rectangular matrices\n\n";

#include <petscmat.h>
int main(int argc,char **args)
{
  Mat               A,B;
  PetscErrorCode    ierr;
  PetscInt          m=3,n=4,i;
  PetscMPIInt       size,rank;

  PetscInitialize(&argc,&args,(char*)0,help);
  ierr = MPI_Comm_size(PETSC_COMM_WORLD, &size);CHKERRQ(ierr);
  ierr = MPI_Comm_rank(PETSC_COMM_WORLD, &rank);CHKERRQ(ierr);

  ierr = MatCreate(PETSC_COMM_WORLD, &A); CHKERRQ(ierr);
  ierr = MatSetSizes(A, m, n, PETSC_DETERMINE, PETSC_DETERMINE);CHKERRQ(ierr);
  ierr = MatSetType(A, MATAIJ);CHKERRQ(ierr);
  ierr = MatSetUp(A);CHKERRQ(ierr);

  if (!rank) {
    for (i=0;i<size*PetscMin(m,n);i++) {
      ierr = MatSetValue(A, i, i, 1.0, INSERT_VALUES); CHKERRQ(ierr);
    }
  }
  ierr = MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr);

  ierr = MatCreateRedundantMatrix(A, size, MPI_COMM_NULL, MAT_INITIAL_MATRIX, &B);CHKERRQ(ierr);
  if (!rank) {
    ierr = MatView(B,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr);
  }

  ierr = MatDestroy(&A); CHKERRQ(ierr);
  ierr = MatDestroy(&B); CHKERRQ(ierr);
  ierr = PetscFinalize();

  return ierr;
}