petsc-3.14.6 2021-03-30

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MatGetInertia

Gets the inertia from a factored matrix

Synopsis

#include "petscmat.h" 
PetscErrorCode MatGetInertia(Mat mat,PetscInt *nneg,PetscInt *nzero,PetscInt *npos)

Collective on Mat

Input Parameter

mat

- the matrix

Output Parameters

	nneg	- number of negative eigenvalues
	nzero	- number of zero eigenvalues
	npos	- number of positive eigenvalues

Notes

Matrix must have been factored by MatCholeskyFactor()

Level

advanced

Location

src/mat/interface/matrix.c

Implementations

MatGetInertia_SBAIJMUMPS in src/mat/impls/aij/mpi/mumps/mumps.c
MatGetInertia_SuperLU_DIST in src/mat/impls/aij/mpi/superlu_dist/superlu_dist.c
MatGetInertia_MKL_PARDISO in src/mat/impls/aij/seq/mkl_pardiso/mkl_pardiso.c
MatGetInertia_SeqSBAIJ in src/mat/impls/sbaij/seq/sbaijfact.c

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