[GRASS-user] r.series weights to zero

[Frank DAVID]

Cordialement,
Frank David

-------- Message d'origine --------
De : Markus Metz
Date :07/06/2018 17:30 (GMT+01:00)
À : Frank David
Cc : grass-user , GRASS developers list
Objet : Re: [GRASS-user] r.series weights to zero



On Tue, Jun 5, 2018 at 2:51 PM, Frank David <frank.david at geophom.fr> wrote:
>
> Hi all Grass users,
>
> It's seems that r.series weights does not accept zero as weight... Is it possible ?

Yes, weights must be positive.

> and so, why ?

A zero weight means that all values in this map are ignored. Zero weights can also cause the sum of weights to be zero, leading to division by zero and finally to +inf / -inf as a result

Thank you Markus for your reply.
I would think it would have been interesting to use zero as weight on some raster in order to use (or not) them depending on the context. For my purpose i will use a value next to zero.
Thanks again
Frank



Markus M
>
> I've got the following error message when running r.series with one weight set to 0
>
> "/usr/local/grass-7.4.0svn/etc/python/grass/script/core.py",
> line 332, in handle_errors
>     returncode=returncode)
> grass.exceptions.CalledModuleError: Module run None
>
> Thank you for your comment.
>
> Frank
>
>
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