[GRASS-user] r.series weights to zero

GRASS GRASS user
1

Cordialement,Frank David

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

On Tue, Jun 5, 2018 at 2:51 PM, Frank David <frank.david@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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