MatIsStructurallySymmetricKnown

Checks if a matrix knows if it is structurally symmetric or not and its structurally symmetric state

Synopsis

#include "petscmat.h" 
PetscErrorCode MatIsStructurallySymmetricKnown(Mat A, PetscBool *set, PetscBool *flg)

Not Collective

Input Parameter

• A - the matrix to check

Output Parameters

• set - PETSC_TRUE if the matrix knows its structurally symmetric state (this tells you if the next flag is valid)

• flg - the result (only valid if set is PETSC_TRUE)

Notes

One can declare that a matrix is structurally symmetric with MatSetOption(mat,MAT_STRUCTURALLY_SYMMETRIC,PETSC_TRUE) and if it is known to remain structurally symmetric after changes to the matrices values one can call MatSetOption(mat,MAT_STRUCTURAL_SYMMETRY_ETERNAL,PETSC_TRUE)

Use MatIsStructurallySymmetric() to explicitly check if a matrix is structurally symmetric (this is an expensive operation)

See Also

Matrices, Mat, MAT_STRUCTURALLY_SYMMETRIC, MatTranspose(), MatIsTranspose(), MatIsHermitian(), MatIsStructurallySymmetric(), MatSetOption(), MatIsSymmetric(), MatIsHermitianKnown()

Level

advanced

Location

src/mat/interface/matrix.c

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Index of all Mat routines
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Index of all manual pages