petsc-3.8.4 2018-03-24
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MatGetDiagonal

 Gets the diagonal of a matrix.

Synopsis

#include "petscmat.h" 
PetscErrorCode MatGetDiagonal(Mat mat,Vec v)
Logically Collective on Mat and Vec

Input Parameters

mat - the matrix
v - the vector for storing the diagonal

Output Parameter

v -the diagonal of the matrix

Note

Currently only correct in parallel for square matrices.

See Also

MatGetRow(), MatCreateSubMatrices(), MatCreateSubMatrix(), MatGetRowMaxAbs()

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

Examples

src/ksp/pc/examples/tutorials/ex1.c.html
src/ksp/pc/examples/tutorials/ex2.c.html
src/ksp/ksp/examples/tutorials/ex15.c.html
src/ksp/ksp/examples/tutorials/ex52.c.html
src/ksp/ksp/examples/tutorials/ex15f.F.html
src/snes/examples/tutorials/ex70.c.html