MatIsStructurallySymmetricKnown#

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

Synopsis#

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#

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

Level#

advanced

Location#

src/mat/interface/matrix.c


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