petsc-3.14.6 2021-03-30

MatFDColoringGetPerturbedColumns

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

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

Not Collective

coloring

- coloring context created with MatFDColoringCreate()

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

Note: IF the matrix type is BAIJ, then the block column indices are returned

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)

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