SNESMultiblockGetSubSNES — PETSc 3.21.4 documentation

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# SNESMultiblockGetSubSNES

Gets the `SNES` contexts for all blocks in a `SNESMULTIBLOCK` solver.

## Synopsis

    #include "petscsnes.h"
    PetscErrorCode SNESMultiblockGetSubSNES(SNES snes, PetscInt *n, SNES *subsnes[])

Not Collective but each `SNES` obtained is parallel

## Input Parameter

- snes - the solver context

## Output Parameters

- n - the number of blocks

- subsnes - the array of `SNES` contexts

## Notes

After `SNESMultiblockGetSubSNES()` the array of `SNES`s MUST be freed by the user (not each `SNES`, just the array that contains them).

You must call `SNESSetUp()` before calling `SNESMultiblockGetSubSNES()`.

## See Also

SNES: Nonlinear Solvers, `SNES`, `SNESMULTIBLOCK`, `SNESMultiblockSetIS()`, `SNESMultiblockSetFields()`

## Level

advanced

## Location

src/snes/impls/multiblock/multiblock.c

## Implementations

SNESMultiblockGetSubSNES_Default() in src/snes/impls/multiblock/multiblock.c

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