petsc-3.13.6 2020-09-29

MatSetValuesLocal

Inserts or adds values into certain locations of a matrix, using a local numbering of the nodes.

Synopsis

#include "petscmat.h" 
PetscErrorCode MatSetValuesLocal(Mat mat,PetscInt nrow,const PetscInt irow[],PetscInt ncol,const PetscInt icol[],const PetscScalar y[],InsertMode addv)

Not Collective

Input Parameters

	mat	- the matrix
	nrow, irow	- number of rows and their local indices
	ncol, icol	- number of columns and their local indices
	y	- a logically two-dimensional array of values
	addv	- either INSERT_VALUES or ADD_VALUES, where ADD_VALUES adds values to any existing entries, and INSERT_VALUES replaces existing entries with new values

Notes

If you create the matrix yourself (that is not with a call to DMCreateMatrix()) then you MUST call MatXXXXSetPreallocation() or MatSetUp() before using this routine

If you create the matrix yourself (that is not with a call to DMCreateMatrix()) then you MUST call MatSetLocalToGlobalMapping() before using this routine

Calls to MatSetValuesLocal() with the INSERT_VALUES and ADD_VALUES options cannot be mixed without intervening calls to the assembly routines.

These values may be cached, so MatAssemblyBegin() and MatAssemblyEnd() MUST be called after all calls to MatSetValuesLocal() have been completed.

Developer Notes

This is labeled with C so does not automatically generate Fortran stubs and interfaces because it requires multiple Fortran interfaces depending on which arguments are scalar or arrays.

Level

intermediate

MatSetValuesLocal

Synopsis

Input Parameters

Notes

Developer Notes

See Also

Level

Location

Examples

Implementations