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
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(), 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(),
MatZeroRowsColumnsLocal(), MatZeroRows(), MatZeroRowsColumnsIS(), MatZeroRowsColumnsStencil()
Level#
intermediate
Location#
Examples#
Index of all Mat routines
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Index of all manual pages