[GRASS-user] map calculator in python loop

[Alessandro Sebastiani]

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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