2011/4/13 Gaspar Reyes Póndigo <[email protected]>:
> Hello, Dear grass_user. My first forum participation in the grass_user list
> email.

Welcome!

> How to extract values of map raster with r.mapcalc? I need make new map
> raster based on specific value  of other raster.

Please take a look at the if() conditions:

http://grass.osgeo.org/grass64/manuals/html64_user/r.mapcalc.html

Therein is also a section EXAMPLES.

Markus
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