## DESCRIPTION

r.li.simpson calculates the "simpson's diversity index" as:
with:

- i: patch type
- m: number of patch type
- pi: proportion of the landscape occupied by patch type i

## EXAMPLES

To calculate simpson's diversity index on map my_map, using my_conf configuration file and saving results in my_out file run:

    r.li.simpson input=my_map conf=my_conf output=my_out

## NOTES

Do not use absolute path names for output files. They are raster if moving window disposition was selected, otherwise they are in ~/.r.li/output folder.
If input raster is full of null values r.li.simpson returns -1.
If you want to have null values instead run

    r.null setnull=-1 map=my_map

after index calculation.

## SEE ALSO

r.li

## AUTHORS

Serena Pallecchi student of Computer Science University of Pisa (Italy).
Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)

Last changed: $Date$