[GRASS-user] Report on r.mapcalc issue

[Andrea Balotti]

Hi,
I tested using 7.4.4 on Win10 and worked as expected using the gui. I 
tested:
r.mapcalc expression="new_map = integer_map / 10.0"
r.info map=new_map

returns: "Data Type:    DCELL " and query on one point gives the 
expected value.

If is not a problem of setting properly g.region before r.mapcalc, I 
have no idea of what can cause your wrong result.
cheers,

Andrea Balotti

Il 15/02/2019 17:28, Pilafin ha scritto:
> Hi everyone,
> I'm using Grass 7.4.4 on Windows 7 to perform a simple operation (division
> by 10.0) of a raster map using r.mapcalc gui and I noticed that the obtained
> results are not correct, e.g. 164 / 10.0 = 15 instead of 16.4.
> I tried to do the same operation with Grass 6.4 and it went fine.
> Then I switched to Grass 7.4.4 again and I tried to use the command line,
> and it gives the correct results.
>
> I think there is a problem in the r.mapcalc gui, has someone else
> encountered this strange behavior?
>
>
> P.S.: In the following lines, the results of a query on a point:
>
> est, nord: 2.85667275343, 42.3684893758
> DTM at DTM:
>    color: 072:022:104
>    value: 164
> DTM_grass7 at DTM:
>    color: 072:020:103
>    value: 15
> DTM_grass6 at DTM:
>    color: 072:022:104
>    value: 16.4
> DTM_grass7_cmd at DTM:
>    color: 072:022:104
>    value: 16.4
>
>
>
> --
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