<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body ><div><br></div><div><br></div><div><br></div>Cordialement,<div>Frank David</div><br><br><div style="font-size:100%;text-align:left;color:#000000"><div>-------- Message d'origine --------</div><div>De : Markus Metz <markus.metz.giswork@gmail.com> </markus.metz.giswork@gmail.com></div><div>Date :07/06/2018 17:30 (GMT+01:00) </div><div>À : Frank David <frank.david@geophom.fr> </frank.david@geophom.fr></div><div>Cc : grass-user <grass-user@lists.osgeo.org>, GRASS developers list <grass-dev@lists.osgeo.org> </grass-dev@lists.osgeo.org></grass-user@lists.osgeo.org></div><div>Objet : Re: [GRASS-user] r.series weights to zero </div><div><br></div></div><div dir="ltr"><br><br>On Tue, Jun 5, 2018 at 2:51 PM, Frank David <<a href="mailto:frank.david@geophom.fr">frank.david@geophom.fr</a>> wrote:<br>><br>> Hi all Grass users,<br>><br><div>> It's seems that r.series weights does not accept zero as weight... Is it possible ?</div><div><br></div><div>Yes, weights must be positive.<br></div><div><br></div><div>> and so, why ?</div><div><br></div><div>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</div><div><br></div><div>Thank you Markus for your reply.</div><div>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.</div><div>Thanks again</div><div>Frank</div><div><br></div><div><br></div><div><br></div><div>Markus M<br></div><div>></div>> I've got the following error message when running r.series with one weight set to 0<br>><br>> "/usr/local/grass-7.4.0svn/etc/python/grass/script/core.py",<br>> line 332, in handle_errors<br>> returncode=returncode)<br>> grass.exceptions.CalledModuleError: Module run None<br>><br>> Thank you for your comment.<br>><br>> Frank<br>><br>><br>> _______________________________________________<br>> grass-user mailing list<br>> <a href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a><br>> <a href="https://lists.osgeo.org/mailman/listinfo/grass-user">https://lists.osgeo.org/mailman/listinfo/grass-user</a><br><br></div>
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