#include "petscmat.h" PetscErrorCode MatZeroRows(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 (0.0 will even eliminate diagonal entry) |
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).
For the parallel case, all processes that share the matrix (i.e., those in the communicator used for matrix creation) MUST call this routine, regardless of whether any rows being zeroed are owned by them.
Each processor can indicate any rows in the entire matrix to be zeroed (i.e. each process does NOT have to list only rows local to itself).
Level:intermediate
Location:src/mat/interface/matrix.c
Index of all Mat routines
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