MatZeroRowsLocal#
Zeros all entries (except possibly the main diagonal) of a set of rows of a matrix; using local numbering of rows.
Synopsis#
#include "petscmat.h" 
PetscErrorCode MatZeroRowsLocal(Mat mat, PetscInt numRows, const PetscInt rows[], PetscScalar diag, Vec x, Vec b)
Collective
Input Parameters#
- mat - the matrix 
- numRows - the number of rows to remove 
- rows - the local row indices 
- 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 MatZeroRowsLocal(), the user must first set the
local-to-global mapping by calling MatSetLocalToGlobalMapping(), this is often already set for matrices obtained with DMCreateMatrix().
See MatZeroRows() for details on how this routine operates.
See Also#
Matrices, Mat, MatZeroRowsIS(), MatZeroRowsColumns(), MatZeroRowsLocalIS(), MatZeroRowsStencil(), MatZeroEntries(), MatZeroRows(), MatSetOption(),
MatZeroRowsColumnsLocal(), MatZeroRowsColumnsLocalIS(), MatZeroRowsColumnsIS(), MatZeroRowsColumnsStencil()
Level#
intermediate
Location#
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages