MatFDColoringGetPerturbedColumns#

Returns the indices of the columns that that are currently being perturbed.

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatFDColoringGetPerturbedColumns(MatFDColoring coloring, PetscInt *n, const PetscInt *cols[])

Not Collective

Input Parameter#

coloring - coloring context created with MatFDColoringCreate()

Output Parameters#

n - the number of local columns being perturbed
cols - the column indices, in global numbering

Note#

IF the matrix type is MATBAIJ, then the block column indices are returned

Fortran Note#

This routine has a different interface for Fortran

     #include <petsc/finclude/petscmat.h>
          use petscmat
          PetscInt, pointer :: array(:)
          PetscErrorCode  ierr
          MatFDColoring   i
          call MatFDColoringGetPerturbedColumnsF90(i,array,ierr)
      use the entries of array ...
          call MatFDColoringRestorePerturbedColumnsF90(i,array,ierr)