[GRASS-user] mapcalc/mapcalculator in python script

[Rainer M Krug]

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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


> 
> 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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