[GRASS-user] Compiling addons from svn repository
mlennert at club.worldonline.be
Mon Aug 4 08:16:45 EDT 2008
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]));
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