static char help[] = "Tests MatShift for SeqAIJ matrices with some missing diagonal entries\n\n";

#include <petscmat.h>

int main(int argc,char **argv)
{
  Mat                  A;
  PetscInt             coli[4],row;
  PetscScalar          vali[4];
  PetscMPIInt          size;

  PetscCall(PetscInitialize(&argc,&argv,(char*)0,help));
  PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size));
  PetscCheck(size == 1,PETSC_COMM_WORLD,PETSC_ERR_WRONG_MPI_SIZE,"This is a uniprocessor example only!");

  PetscCall(MatCreate(PETSC_COMM_SELF,&A));
  PetscCall(MatSetSizes(A,4,4,4,4));
  PetscCall(MatSetType(A,MATSEQAIJ));
  PetscCall(MatSeqAIJSetPreallocation(A,4,NULL));

  row = 0; coli[0] = 1; coli[1] = 3; vali[0] = 1.0; vali[1] = 2.0;
  PetscCall(MatSetValues(A,1,&row,2,coli,vali,ADD_VALUES));

  row = 1; coli[0] = 0; coli[1] = 1; coli[2] = 2; coli[3] = 3; vali[0] = 3.0; vali[1] = 4.0; vali[2] = 5.0; vali[3] = 6.0;
  PetscCall(MatSetValues(A,1,&row,4,coli,vali,ADD_VALUES));

  row = 2; coli[0] = 0; coli[1] = 3; vali[0] = 7.0; vali[1] = 8.0;
  PetscCall(MatSetValues(A,1,&row,2,coli,vali,ADD_VALUES));

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

  PetscCall(MatShift(A,0.0));
  PetscCall(MatView(A,PETSC_VIEWER_STDOUT_WORLD));

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

/*TEST

   test:

TEST*/