petsc-3.14.6 2021-03-30

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MatIsSymmetric

Test whether a matrix is symmetric

Synopsis

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

Collective on Mat

Input Parameter

	A	- the matrix to test
	tol	- difference between value and its transpose less than this amount counts as equal (use 0.0 for exact transpose)

Output Parameters

flg

- the result

Notes

For real numbers MatIsSymmetric() and MatIsHermitian() return identical results

See Also

MatTranspose(), MatIsTranspose(), MatIsHermitian(), MatIsStructurallySymmetric(), MatSetOption(), MatIsSymmetricKnown()

Level

intermediate

Location

src/mat/interface/matrix.c

Examples

src/ksp/ksp/tutorials/ex72.c.html

Implementations

MatIsSymmetric_MPIAIJ in src/mat/impls/aij/mpi/mpiaij.c
MatIsSymmetric_SeqAIJ in src/mat/impls/aij/seq/aij.c
MatIsSymmetric_SeqDense in src/mat/impls/dense/seq/dense.c
MatIsSymmetric_IS in src/mat/impls/is/matis.c
MatIsSymmetric_SeqSBAIJ in src/mat/impls/sbaij/seq/sbaij.c

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