[R-sig-Geo] execGRASS() for r.mapcalc?

[Roger Bivand]

On Thu, 19 Nov 2009, Agustin Lobo wrote:

> I'm used to do:
>> cmd = "r.mapcalc 'delme=100'"
>> system(cmd)
>
> and works, but how could I do the equivalent using execGRASS() ?

You cannot. r.mapcalc does not provide an --interface-description XML 
self-definition. You have either to use system() as before (with different 
quoting reimes for different OS), or r.mapcalculator in execGRASS(). This 
problem is shared with other interfaces using --interface-description.

Roger

> I've tried:
>
>> doGRASS(cmd)
> Error in parseGRASS(cmd) : r.mapcalc 'delme=100' not parsed
>
>> execGRASS(cmd)
> Error in parseGRASS(cmd) : r.mapcalc 'delme=100' not parsed
>
> I can always use paste() to make any cmd string, but seems to me that 
> execGRASS() would be cleaner.
>
> Thanks
>
> Agus
>
> _______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo at stat.math.ethz.ch
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no