#include "petscmat.h" PetscErrorCode MatZeroRowsLocal(Mat mat,PetscInt numRows,const PetscInt rows[],PetscScalar diag)Collective on Mat
mat | - the matrix | |
numRows | - the number of rows to remove | |
rows | - the global row indices | |
diag | - value put in all diagonals of eliminated rows |
For the AIJ matrix formats this removes the old nonzero structure, but does not release memory. For the dense and block diagonal formats this does not alter the nonzero structure.
If the option MatSetOption(mat,MAT_KEEP_NONZERO_PATTERN,PETSC_TRUE) the nonzero structure of the matrix is not changed (even for AIJ and BAIJ matrices) the values are merely zeroed.
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).
Level:intermediate
Location:src/mat/interface/matrix.c
Index of all Mat routines
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Index of all manual pages