[GRASS-user] Problem with r. mapcalc

[Giuseppe Amatulli]

Sorry, my wrong conclusion
Single-precision floating-point variables are able to represent integers
between [-16777216, 16777216]
maybe better to report in the r.out.gdal data type table


On Thu, 25 Feb 2021 at 12:20, Giuseppe Amatulli <giuseppe.amatulli at gmail.com>
wrote:

> Thanks to both of you!!
> Now I got it! So the
> Float32, CFloat32       -3.4E38   3.4E38 range identify the maximum number
> of characters in the binary format and not in the decimal format - correct?
> So even if 3024784769025  fit as a decimal number in -3.4E38   3.4E38 does
> not fit as binary - correct?
> ...this one I did not know... I spent a few days on this.
>
> yes r.info gives the scientific format so it will be nice to have also
> the long decimal  number.. .to spot this kind of errors.
> Giuseppe
>
>
>
> On Thu, 25 Feb 2021 at 11:29, Maris Nartiss <maris.gis at gmail.com> wrote:
>
>> Markus, output of r.univar and r.info both can have scientific
>> notation in their range outputs.
>>
>> Giuseppe, at least on my system r.mapcalc for floating point
>> expressions (if one of operands is floating point) defaults to double
>> (stored as DCELL). Still to be safe you can convert one of operands
>> (e.g. input map with ints) to double with double() as Markus already
>> pointed out.
>>
>> Good luck,
>> Māris.
>>
>
>
> --
> Giuseppe Amatulli, Ph.D.
>
> Research scientist at
> School of the Environment
> Yale University
> New Haven, CT, USA - 06511
> Tweeter: @BigDataEcology
> Teaching: http://spatial-ecology.net
> Work:  https://environment.yale.edu/profile/giuseppe-amatulli/
>
>

-- 
Giuseppe Amatulli, Ph.D.

Research scientist at
School of the Environment
Yale University
New Haven, CT, USA - 06511
Tweeter: @BigDataEcology
Teaching: http://spatial-ecology.net
Work:  https://environment.yale.edu/profile/giuseppe-amatulli/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/grass-user/attachments/20210225/a4f3dce3/attachment.html>