[GRASS-user] how to store results from r.sum with script

[Vaclav Petras]

On Mon, Jan 13, 2014 at 10:42 AM, BLANDENIER Lucien <
lucien.blandenier at unine.ch> wrote:

> The -g flag is not valide for this module...
>
>
OK, now I understand, r.sum was merged to
r.statistics<http://grass.osgeo.org/grass70/manuals/r.statistics.html>
, r.statistics2 <http://grass.osgeo.org/grass70/manuals/r.statistics2.html>
, r.statistics3 <http://grass.osgeo.org/grass70/manuals/r.statistics3.html> in
GRASS 7, it is available only in GRASS 6.

http://grass.osgeo.org/grass64/manuals/r.sum.html
https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures


> Do you know if there is others possibilities?
>
> Yes, use what I wrote before (explained in that email):

$ eval $(echo "SUM = 16116.500006" | sed -e "s/ //g")
$ echo $SUM
16116.500006

For r.sum in GRASS 6 in NC sample location:

> eval $(r.sum elevation | sed -e "s/ //g")
> echo $SUM
27569640.087723
> SUM_elevation=$SUM
> echo $SUM_elevation
27569640.087723

or shorter

> SUM_elevation=$(r.sum elevation | sed -e "s/SUM = //g")
> echo $SUM_elevation
27569640.087723



Thanks a lot
>
> Lucien
>
>
> ________________________________
> De : Vaclav Petras [wenzeslaus at gmail.com]
> Envoyé : lundi 13 janvier 2014 16:34
> À : BLANDENIER Lucien
> Cc : grass-user at lists.osgeo.org
> Objet : Re: [GRASS-user] how to store results from r.sum with script
>
> Try remove spaces from r.sum command output (e.g. using `sed`) and since
> the results is
>
> SUM=16116.500006
>
> which is valid bash variable definition, you can use `eval` command which
> will define the variable, so you can use it afterwards.
>
> $ eval $(echo "SUM = 16116.500006" | sed -e "s/ //g")
> $ echo $SUM
> 16116.500006
>
> I assume from what you have written that `r.sum rast=map at mapset` prints
>
> SUM = 16116.500006
>
> to standard output. Knowing what is the output of that module is crucial.
> What module is this, do you have documentation? GRASS modules (in GRASS
> distribution) use the convention that if you use `-g` flag they print the
> variables in "shell script style", so you can use the output in eval
> function or parse it easily. They output would be
>
> SUM = 16116.500006
>
>
> On Mon, Jan 13, 2014 at 10:20 AM, BLANDENIER Lucien <
> lucien.blandenier at unine.ch<mailto:lucien.blandenier at unine.ch>> wrote:
> Hello Vaclav,
>
> I tried with the following script:
>
> $C=$(r.sum rast=map at mapset)
> $echo $C
> SUM = 16116.500006
>
>
> But I think the variable C stores all the command (r.sum rast=map at mapset)
> and not only the result. Do you know how it would be possible to store the
> result "SUM = 16116.500006"
>
>
> Regards
>
> Lucien
>
>
> ________________________________
> De : Vaclav Petras [wenzeslaus at gmail.com<mailto:wenzeslaus at gmail.com>]
> Envoyé : dimanche 12 janvier 2014 03:11
> À : BLANDENIER Lucien
> Cc : grass-user at lists.osgeo.org<mailto:grass-user at lists.osgeo.org>
> Objet : Re: [GRASS-user] how to store results from r.sum with script
>
> Hi,
>
> I might missed it but I don't know about r.sum module. (I know only r.sun).
>
> Saving standard output of module (if it prints something to standard
> output) is the same as for any other command line tool in bash. If the
> output is a map (in GRASS) just use it as input to some other module (using
> the map name).
>
> Examples bellow show saving outputs of echo command to variables (echo
> command just print its parameters to standard output, i.e. to command
> line). Working with numbers (additions, multiplications) can be more
> difficult (requires different syntax) but there should be some online
> guides.
>
> Vaclav
>
>
> $ A="some text"
> $ echo $A
> some text
>
> $ B=`echo "this is printed to stdout"`
> $ echo $B
> this is printed to stdout
>
> $ C=$(echo "this is printed to stdout")
> $ echo $C
> this is printed to stdout
>
> (lines beginning with $ are lines with command which are meant to by typed
> into the command line, the other lines are output)
>
>
> On Sat, Jan 11, 2014 at 9:32 AM, BLANDENIER Lucien <
> lucien.blandenier at unine.ch<mailto:lucien.blandenier at unine.ch><mailto:
> lucien.blandenier at unine.ch<mailto:lucien.blandenier at unine.ch>>> wrote:
> Dear all,
>
> I would like to know if there is a way to store results of a calculation
> done with r.sum on many raster with a bash script.
>
> I need to reuse these results in later calculations.
>
> Thanks
>
>
> Lucien
>
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