[GRASS-user] map calculator in python loop

[st_kiefer at web.de]

Hi Alessandro,
it would be great, if you also comunicate the actual solution, i.e. the proper "g.list"-command, or where you made the mistake. The mapcalc-call seems not to bee what caused the troubles. If someone runs into the same trouble as you, he would have the right hint immediately.

regards

Stefan

> Alessandro Sebastiani <alessandro.sebastiani at uniroma1.it> hat am 13. Dezember 2018 um 09:15 geschrieben:
> 
> 
> dear all,
> i found where the error was! i didn't set the "g.list" command properly, in
> fact the map calculator could not find maps . However , here it is how i
> ran the mapcalc:
> > gscript.mapcalc ( " %s = %s * %s "  % ((r+"k") , r , c))
> to Frank : k is just a suffix i wanted to use in order to give to the new
> map a name similar to the older map (r in this case)
> 
> Il giorno mer 12 dic 2018 alle ore 13:01 Frank David <frank.david at geophom.fr>
> ha scritto:
> 
> > Hi,
> >
> > What do you want to do with "k" ?
> >
> > Can you send what return gscript.verbose(( " %s = %s * %s ")  % (r , r ,
> > c))
> >
> > Frank
> > Le 12/12/2018 à 17:34, Alessandro Sebastiani a écrit :
> > > I get the same error after trying with your suggestion! I tried to
> > > define rasters in different ways, like
> > > >> c = ["costante"] ,
> > > but nothing seems to change
> > >
> > > Il giorno mer 12 dic 2018 alle ore 10:22 Moritz Lennert
> > > <mlennert at club.worldonline.be <mailto:mlennert at club.worldonline.be>>
> > > ha scritto:
> > >
> > >     On 12/12/18 12:59, Alessandro Sebastiani wrote:
> > >     > dear all,
> > >     > i'm dealing this time with r.mapcalc. I have different rasters
> > >     which i
> > >     > grouped using g.list.
> > >     > Now r_list contains all my raster. I want to multiply those
> > >     rasters to
> > >     > another raster (called "costante")  in order to obtain a new
> > >     map, that i
> > >     > want to call as r followed by the letter "k"
> > >     > Here it is what i've done:
> > >     > import grass.script as gscript
> > >     >  >>> r_list = gscript.read_command("g.list" , type = "rast"
> > >     > ).strip().split("\n")
> > >     >  >>> c = " costante"
> > >     >  >>> for r in r_list:
> > >     >  >>>     gscript.mapcalc ( " %s = %s * %s "  % ((r+"k") , r , c))
> > >
> > >     Try
> > >
> > >     " %sk = %s * %s "  % (r , r , c) "
> > >
> > >     Moritz
> > >
> > >
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