MatPermuteSparsify

Creates a new matrix with rows and columns permuted from the original and sparsified to the prescribed tolerance.

#include "petscmat.h" 
int MatPermuteSparsify(Mat A, int band, PetscReal frac, PetscReal tol, IS rowp, IS colp, Mat *B)

Collective on Mat

	A	- The matrix to permute
	band	- The half-bandwidth of the sparsified matrix, or PETSC_DECIDE
	frac	- The half-bandwidth as a fraction of the total size, or 0.0
	tol	- The drop tolerance
	rowp	- The row permutation
	colp	- The column permutation

B -The permuted, sparsified matrix

The default behavior (band = PETSC_DECIDE and frac = 0.0) is to restrict the half-bandwidth of the resulting matrix to 5% of the total matrix size.

matrix, permute, sparsify