[GRASS-user] using r.mapcalc

[Thomas Drüssler]

Hello everybody

please help me solving a problem concerning r.mapcalc:
my intention is to calculate a new map consisting of two older ones. the one 
shows  digitized elements( rocks), cat values are NULL or 1, 
the other is a reclassified map(slope >50), with cat values 1 or NULL. 
so i have 4 options:
pixels, with only digitized elements, pixels with only slope elements, pixels with both and pixels without(NULL)
the resulting map sould consist of these 4 categories.
i already tried r.patch, but with no success, there was only one resulting category and NULL values.

thanx a lot
thomas
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