r.mapcalc

[Malcolm Williamson]

On Tue, 21 Oct 1997, Stephan Eickschen wrote:

> Hi GRASSers
> 
> I 've got two questions (which I hope not to be to silly ;-) )
> 
> -1-
> 
> Is it possible to use r.mapcalc to calculate the minimum, maximum and /
> or the average of raster layers with using UNIX wild cards ("*" in my
> case) such as:
> 
> r.mapcalc max970124=max(a12*970124*)
> 
> to calculate a raster layer called max970124 of the maximum of all
> raster layers matching "a12*970124".
> 
No, "*" means "multiply" in r.mapcalc. As far as I know, no wildcards are 
supported in r.mapcalc, so you'll have to manually enter all of those map 
names. Now, if you're clever, you could write a shell script that _would_ 
use a wild card to create your r.mapcalc statement and then run it. Don't 
forget that there is a limit to the number of files you can have open; it 
seems to me that it is something around 27.
	-Malcolm Williamson




> -2-
> 
> Could anyone give me a pointer to an introduction to MAPGEN, please?
> I 've found
> > User's Manual for MAPGEN (UNIX version): a method of
> >                 transforming digital cartographic data to a map,",
> >                 G.I. Evenden, J.M. Botbol, USGS Open-File Report
> > 85-706, 58p.
> as a reference, but not as a PS (like some other USGS OF Reports...)
> 
> Regards,
> 
> 	Stephan
> 
> -- 
> ------------------------------------------------------------------------
> 
> Stephan Eickschen                     Tel. : +49 (0)251 83-34704
> Westfaelische Wilhelms-Universitaet   Fax. : +49 (0)251 83-36100
> Institute for Geophysics
> Research Unit of Physical Glaciology  email: eicksch at uni-muenster.de
> Corrensstrasse 24
> 48149 Muenster
> Germany
> 
> ------------------------------------------------------------------------
>