petsc-main 2021-04-20
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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_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