petsc-3.12.5 2020-03-29

DMPlexGetOrdering

Calculate a reordering of the mesh

Synopsis

#include "petscdmplex.h"   
#include "petscmat.h"      
PetscErrorCode DMPlexGetOrdering(DM dm, MatOrderingType otype, DMLabel label, IS *perm)

Collective on dm

Input Parameter

    MATORDERINGNATURAL - Natural

    MATORDERINGND - Nested Dissection

    MATORDERING1WD - One-way Dissection

    MATORDERINGRCM - Reverse Cuthill-McKee

    MATORDERINGQMD - Quotient Minimum Degree

	dm	- The DMPlex object
	otype	- type of reordering, one of the following:
	label	- [Optional] Label used to segregate ordering into sets, or NULL

Output Parameter

perm -The point permutation as an IS, perm[old point number] = new point number

Note: The label is used to group sets of points together by label value. This makes it easy to reorder a mesh which has different types of cells, and then loop over each set of reordered cells for assembly.

Level

intermediate

Location