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# ISGlobalToLocalMappingMode
Indicates mapping behavior if global indices are missing 
## Synopsis
```
#include "petscis.h" 
typedef enum {
  IS_GTOLM_MASK,
  IS_GTOLM_DROP
} ISGlobalToLocalMappingMode;
```

## Values

- ***`IS_GTOLM_MASK` -*** missing global indices are masked by mapping them to a local index of -1
- ***`IS_GTOLM_DROP` -*** missing global indices are dropped





## See Also
 `ISGlobalToLocalMappingApplyBlock()`, `ISGlobalToLocalMappingApply()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscis.h.html#ISGlobalToLocalMappingMode">include/petscis.h</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/is/tutorials/ex4.c.html">src/vec/is/is/tutorials/ex4.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/is/tutorials/ex5.c.html">src/vec/is/is/tutorials/ex5.c</A><BR>


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