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# PetscSpaceSumSetSubspace
Set a space in the sum space
## Synopsis
```
#include "petscfe.h"
PetscErrorCode PetscSpaceSumSetSubspace(PetscSpace sp, PetscInt s, PetscSpace subsp)
```
## Input Parameters
- ***sp -*** the function space object
- ***s -*** The space number
- ***subsp -*** the number of spaces
## Note
The name SetSubspace is slightly misleading because it is actually setting one of the defining spaces of the sum, not a Subspace of it
## See Also
`PETSCSPACESUM`, `PetscSpace`, `PetscSpaceSumGetSubspace()`, `PetscSpaceSetDegree()`, `PetscSpaceSetNumVariables()`
## Level
intermediate
## Location
src/dm/dt/space/impls/sum/spacesum.c
## Implementations
PetscSpaceSumSetSubspace_Sum in src/dm/dt/space/impls/sum/spacesum.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/dt/space/impls/sum/spacesum.c)
[Index of all SPACE routines](index.md)
[Table of Contents for all manual pages](/manualpages/index.md)
[Index of all manual pages](/manualpages/singleindex.md)