petsc-3.7.3 2016-07-24
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# MatGetTrace

Gets the trace of a matrix. The sum of the diagonal entries.

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatGetTrace(Mat mat,PetscScalar *trace)

Collective on Mat

### Input Parameters

mat -the matrix

### Output Parameter

trace -the sum of the diagonal entries

Level:advanced
Location: src/mat/interface/matrix.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages