MatIsTranspose#

Test whether a matrix is another one’s transpose, or its own, in which case it tests symmetry.

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatIsTranspose(Mat A, Mat B, PetscReal tol, PetscBool *flg)

Collective

Input Parameters#

A - the matrix to test
B - the matrix to test against, this can equal the first parameter
tol - tolerance, differences between entries smaller than this are counted as zero

Output Parameter#

flg - the result

Notes#

Only available for MATAIJ matrices.

The sequential algorithm has a running time of the order of the number of nonzeros; the parallel test involves parallel copies of the block-offdiagonal parts of the matrix.