[GRASSLIST:7835] average height

[Maik Trömel]

Hello,
 
i’m searching a function to get the maximum, the minimum und the average
of the heights of a postal-district.
 
I`ve got the “GTOPO30-Model” and a shapefile with the geometrie of the
postal-districts. 
I convertet the shapefile to rasterdata (the postal-codes are still
available). Now i want to use r.mapcalc to get the inforamtions from the
GTOPO30-Model. 
 
I tried: 
r.mapcalc newmap=”if(postalmap=5570,max(GTOPO30),null())”
 
But naturally it didn`t work.
The other functions i tried out didn`t work, too.
 
Does anybody have an idea how I could get the informations?
 
Thanks for your help.
 
Greeting
Maik
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