petsc-3.8.4 2018-03-24
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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 Parameters

coloring -coloring context created with MatFDColoringCreate()

Output Parameters

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

Fortran Note

This routine has a different interface for Fortran 
         use petscisdef

         PetscInt, pointer :: array(:)

         PetscErrorCode  ierr

         MatFDColoring   i

         call MatFDColoringGetPerturbedColumnsF90(i,array,ierr)

     use the entries of array ...

         call MatFDColoringRestorePerturbedColumnsF90(i,array,ierr)

See Also

MatFDColoringCreate(), MatFDColoringDestroy(), MatFDColoringView(), MatFDColoringApply()

Keywords

coloring, Jacobian, finite differences

Level:intermediate
Location:src/mat/matfd/fdmatrix.c
Index of all MatFD routines
Table of Contents for all manual pages
Index of all manual pages