[GRASS-user] Compiling addons from svn repository

[gianluca massei]

Thanks Moritz , great tip!
I'm working in a module that implemented ELECTRE algorithm.

I've just finisced a module named /r.roughset/ for knowledg discovery 
with rough set based on rough set library. You can download the source 
code from grass wiki 
(http://grass.osgeo.org/wiki/GRASS_AddOns#r.roughset) and I'm happy if 
sameone caould try it and report me tips or bugs.
Gianluca

Moritz Lennert ha scritto:
> On 04/08/08 13:39, gianluca massei wrote:
>> Hy list,
>> I'm writing a C module for multiciriteria decision analysis in GRASS. 
>
> Great news ! I'm very interested in this.
>
> If you haven't already, you might want to have a look at the old 
> r.infer and r.weight modules in grass5.4. Also see the GRASS news 
> article by Peter Löwe: http://grass.itc.it/newsletter/grassnews3.html.
>
> Just one suggestion: it might be worthwhile thinking about error 
> handling/propagation in such a module...
>
>> I've a problem with doublevalue  multiple answers processing.
>> The code is like that:
>> "
>> /    weight = G_define_option();
>>  weight->key        = "weight";
>>  weight->type       = TYPE_DOUBLE;
>>  weight->required   = YES;
>>  weight->multiple   = YES;      weight->description = _("Criteria 
>> weight(s) (w1,w2,..)");/
>> "
>>
>> I'd like extract single value so, I tried this:
>> "
>> /    for(i=0;i<ncriteria;i++)
>>      {
>>      G_message(_("Peso %d : %lf"),i,weight->answers[i]);
>>      }/
>> "
>
> Not sure, but I think the ->answers are always string, so you have to 
> transform to float with atof:
>
> G_message(_("Peso %d : %lf"),i,atof(weight->answers[i]));
>
> Moritz
>
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>
>