petsc-3.13.6 2020-09-29
MatZeroRowsColumnsLocalIS
Zeros all entries (except possibly the main diagonal) of a set of rows and columns of a matrix; using local numbering of rows.
Synopsis
#include "petscmat.h"
PetscErrorCode MatZeroRowsColumnsLocalIS(Mat mat,IS is,PetscScalar diag,Vec x,Vec b)
Collective on Mat
Input Parameters
| mat | - the matrix
|
| is | - index set of rows to remove
|
| diag | - value put in all diagonals of eliminated rows
|
| x | - optional vector of solutions for zeroed rows (other entries in vector are not used)
|
| b | - optional vector of right hand side, that will be adjusted by provided solution
|
Notes
Before calling MatZeroRowsColumnsLocalIS(), the user must first set the
local-to-global mapping by calling MatSetLocalToGlobalMapping().
The user can set a value in the diagonal entry (or for the AIJ and
row formats can optionally remove the main diagonal entry from the
nonzero structure as well, by passing 0.0 as the final argument).
See Also
MatZeroRowsIS(), MatZeroRowsColumns(), MatZeroRowsLocalIS(), MatZeroRowsStencil(), MatZeroEntries(), MatZeroRowsLocal(), MatSetOption(),
MatZeroRowsColumnsLocal(), MatZeroRows(), MatZeroRowsColumnsIS(), MatZeroRowsColumnsStencil()
Level
intermediate
Location
src/mat/interface/matrix.c
Examples
src/ksp/ksp/tutorials/ex59.c.html
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages