[GRASS-dev] Overflow warning in r.mapcalc calculation

[Rainer M. Krug]

Paulo van Breugel <p.vanbreugel at gmail.com> writes:

> Hi Glynn and Rainer
>
> Happy to see this exchange of ideas. It would be great if this could be
> implemented. Do you think it is useful I make a feature request on the bug
> tracker (with link to this email thread) so the idea doesn't get lost?

Yes please - I think that would be useful.

Thanks,

Rainer

>
>
>
>
> On Fri, May 17, 2013 at 4:38 PM, Glynn Clements <glynn at gclements.plus.com>wrote:
>
>>
>> Rainer M. Krug wrote:
>>
>> > > One option is to modify round() to take a second argument (defaulting
>> > > to 1), and have it return the first argument rounded to the nearest
>> > > multiple of the second. The return type would be that of the second
>> > > argument, i.e. round(x,1) rounds to the nearest integer and returns an
>> > > integer, round(x,1.0) rounds to the nearest integer and returns a
>> > > float, round(x,1e-3) would round to 3 decimal places (i.e. the nearest
>> > > multiple of 0.001), etc.
>> >
>> > Sounds like a sensible approach without adding to many new
>> > functions. But I would actually split the two, i.e. have two more
>> > arguments, where one specifies the type,
>> > and the other one the number of decimals to round to, i.e.
>> >
>> > round(x, 0, "I") would be the default, rounding to whole number and
>> > return an integer
>>
>> That interface isn't possible. r.mapcalc doesn't have a string type,
>> and there's no way that a function's return type can depend upon the
>> value of a parameter.
>>
>> --
>> Glynn Clements <glynn at gclements.plus.com>
>> _______________________________________________
>> grass-dev mailing list
>> grass-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/grass-dev
>>
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-- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa

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