[GRASS-dev] Re: [GRASS GIS] #1109: g.mlist functionality extension: return e.g. $prefix.001 to $prefix.031 out of $prefix.365 maps

[GRASS GIS]

#1109: g.mlist functionality extension: return e.g. $prefix.001 to $prefix.031 out
of $prefix.365 maps
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 Reporter:  nikos              |       Owner:  grass-dev@…              
     Type:  enhancement        |      Status:  new                      
 Priority:  minor              |   Milestone:                           
Component:  default            |     Version:  unspecified              
 Keywords:  g.mlist, pattern,  |    Platform:  Unspecified              
      Cpu:  Unspecified        |  
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Comment(by nikos):

 Replying to [comment:6 hamish]:
 > as long as it works and is understandable by you, I wouldn't be too
 concerned with how elegant the outer loops are. that's not the
 computationally expensive part.

 I think I understand it (+have the illusion that I am 100% sure I know
 what I am doing :-p)


 > if your map names are longer than ~10 chars in total, beware that the
 maximum command line length may be 4096 chars on some OSs. so eg it may be
 better to sum months to get the full year instead of summing up 365 maps
 directly.

 Actually that is what the script is doing: it creates a list with the days
 of jan, feb, march, etc., which is then fed as an input to "r.series
 method=average".

 The results (per month mean, units as derived from r.sun) over a study
 area in Greece seem rational to me (e.g. r.info for january:
 min=535.582112958354, max=5788.08932396673 and for july:
 min=1695.6559625441, max=8480.92313508065).

 > (although if you can it might be interesting to compare results of doing
 it both ways, in the past I'd gotten two slightly different answers by
 doing that which confused me)

 That is strange. It's only summing and dividing, right? No time currently
 (=added in ToDo list).

 (I still consider the enhancement wish valid, especially when working with
 (r.)series which follow a naming pattern)

 Nikos

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Ticket URL: <https://trac.osgeo.org/grass/ticket/1109#comment:8>
GRASS GIS <http://grass.osgeo.org>