# 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 vector, 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 the IS
that was stored in the file using PetscObjectSetName(). Otherwise you will
get the error message: "Cannot H5DOpen2() with Vec name NAMEOFOBJECT"


## See Also
 `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.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex76f.F90.html">src/ksp/ksp/tutorials/ex76f.F90.html</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](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
