petsc-master 2017-03-28
Report Typos and Errors


Zeros all entries (except possibly the main diagonal) of a set of rows and columns of a matrix; using local numbering of rows.


#include "petscmat.h" 
PetscErrorCode MatZeroRowsColumnsLocal(Mat mat,PetscInt numRows,const PetscInt rows[],PetscScalar diag,Vec x,Vec b)
Collective on Mat

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


Before calling MatZeroRowsColumnsLocal(), 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(),
MatZeroRows(), MatZeroRowsColumnsLocalIS(), MatZeroRowsColumnsIS(), MatZeroRowsColumnsStencil()

Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages