Fwd: Re: [GRASS-user] mapcalc/mapcalculator in python script

[Johannes Radinger]

> 
> On 02/01/2011 03:28 PM, Johannes Radinger wrote:
> > Hello,
> > 
> > I am running GRASS GIS 6.5 and want to run a python script
> > including a mapcaluculator-expression of a simple formula:
> > 
> > A=if(B,C)
> > 
> > grass.mapcalc("$upstream_shreve = if(${upstream_part},${shreve})",
> >                   upstream_shreve = options['upstream_shreve'],
> >                   upstream_part = options['upstream_part'],
> >                   shreve = options['shreve'])
> > 
> > but that isn't working... I don't know whats excaclty the problem....
> 
> I don't know anything about python, but I had a similar problem under R,
> where the problem was escaping of the formula - the formula needed to be
> enclosed in " in grass.
> To diagnose: can you see the command executed under GRASS? Does it work
> if you paste this into GRASS?
> 
> Cheers,
> 
> Rainer


hello,

I still don't know whats the exact problem. And it is not directly possible to paste it into GRASS as the options[] command is processed by
the g.parser module in the end of my script. That's sofar as I understand...

I am not sure if something is wrong with ' and " or with the options-commands. According to the manual (http://grass.osgeo.org/wiki/GRASS_and_Python#Example_for_embedding_r.mapcalc_.28map_algebra.29)
it should work that way...

hopefully someone can help me...

cheers
johannes
> 
> 
> > 
> > hopefully you can help me
> > 
> > thanks
> > Johannes
> 
> 
> - -- 
> Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
> Biology, UCT), Dipl. Phys. (Germany)
> 
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