petsc-3.14.5 2021-03-03
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# ISColoringCreate

Generates an ISColoring context from lists (provided by each processor) of colors for each node.

### Synopsis

    #include "petscis.h"
    PetscErrorCode  ISColoringCreate(MPI_Comm comm,PetscInt ncolors,PetscInt n,const ISColoringValue colors[],PetscCopyMode mode,ISColoring *iscoloring)

Collective

### Input Parameters

| comm | - communicator for the processors creating the coloring
| ncolors | - max color value
| n | - number of nodes on this processor
| colors | - array containing the colors for this processor, color numbers begin at 0.
| mode | - see PetscCopyMode for meaning of this flag.

### Output Parameter

| iscoloring | - the resulting coloring data structure

### Options Database Key

| -is_coloring_view | - Activates ISColoringView()

### Notes

By default sets coloring type to IS_COLORING_GLOBAL

### See Also

MatColoringCreate(), ISColoringView(), ISColoringDestroy(), ISColoringSetType()

### Level

advanced

### Location

src/vec/is/is/utils/iscoloring.c
Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages