MatZeroRowsColumnsLocal#
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 MatZeroRowsColumnsLocal(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 global 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 MatZeroRowsColumnsLocal(), the user must first set the
local-to-global mapping by calling MatSetLocalToGlobalMapping(), this is often already set for matrices obtained with DMCreateMatrix().
See MatZeroRowsColumns() for details on how this routine operates.
See Also#
Matrices, Mat, MatZeroRowsIS(), MatZeroRowsColumns(), MatZeroRowsLocalIS(), MatZeroRowsStencil(), MatZeroEntries(), MatZeroRowsLocal(), MatSetOption(),
MatZeroRows(), MatZeroRowsColumnsLocalIS(), MatZeroRowsColumnsIS(), MatZeroRowsColumnsStencil()
Level#
intermediate
Location#
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages