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# ISLoad
Loads a vector that has been stored in binary or HDF5 format with `ISView()`. 
## Synopsis
```
#include "petscis.h" 
PetscErrorCode ISLoad(IS is, PetscViewer viewer)
```
Collective


## Input Parameters

- ***is -*** the newly loaded index set, this needs to have been created with `ISCreate()` or some related function before a call to `ISLoad()`.
- ***viewer -*** binary file viewer, obtained from `PetscViewerBinaryOpen()` or HDF5 file viewer, obtained from `PetscViewerHDF5Open()`





## Notes
IF using HDF5, you must assign the IS the same name as was used in `is`
that was stored in the file using `PetscObjectSetName()`. Otherwise you will
get the error message: "Cannot H5DOpen2() with Vec name NAMEOFOBJECT"


## See Also
 `IS`, `PetscViewerBinaryOpen()`, `ISView()`, `MatLoad()`, `VecLoad()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/is/interface/index.c.html#ISLoad">src/vec/is/is/interface/index.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex76.c.html">src/ksp/ksp/tutorials/ex76.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex76f.F90.html">src/ksp/ksp/tutorials/ex76f.F90</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/is/is/interface/index.c)


[Index of all IS routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)