MatNestGetSubMat — PETSc 3.21.4 documentation

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# MatNestGetSubMat

Returns a single, sub-matrix from a `MATNEST`

## Synopsis

    #include "petscmat.h"
    PetscErrorCode MatNestGetSubMat(Mat A, PetscInt idxm, PetscInt jdxm, Mat *sub)

Not Collective

## Input Parameters

- A - `MATNEST` matrix

- idxm - index of the matrix within the nest matrix

- jdxm - index of the matrix within the nest matrix

## Output Parameter

- sub - matrix at index `idxm`, `jdxm` within the nest matrix

## See Also

Matrices, `Mat`, `MATNEST`, `MatNestGetSize()`, `MatNestGetSubMats()`, `MatCreateNest()`, `MatNestSetSubMat()`, `MatNestGetLocalISs()`, `MatNestGetISs()`

## Level

developer

## Location

src/mat/impls/nest/matnest.c

## Implementations

MatNestGetSubMat_Nest() in src/mat/impls/nest/matnest.c

Index of all Mat routines
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Index of all manual pages