[GRASS-dev] [GRASS GIS] #1976: r.mapcalc: Allow rounding of floating numbers

[Rainer M. Krug]

"GRASS GIS" <trac at osgeo.org> writes:

> #1976: r.mapcalc: Allow rounding of floating numbers
> -------------------------+--------------------------------------------------
>  Reporter:  pvanbosgeo   |       Owner:  grass-dev@…              
>      Type:  enhancement  |      Status:  new                      
>  Priority:  normal       |   Milestone:  7.0.0                    
> Component:  Raster       |     Version:  unspecified              
>  Keywords:  r.mapcalc    |    Platform:  Unspecified              
>       Cpu:  Unspecified  |  
> -------------------------+--------------------------------------------------
>
> Comment(by mmetz):
>
>  Replying to [ticket:1976 pvanbosgeo]:
>  > The round() function in r.mapcalc always returns an integer, regardless
>  of its argument types. Integers are always 32-bit, so the result is
>  limited to the range +/- 2147483647 (2^31-1).
>  >
>  > Suggestion: extend the function to allow to round numbers outside the
>  integer range, and to round with a specific number of decimal places, like
>  e.g., the function round() in R.
>
>  Try trunk r56313.
>
>  The output type of round() is now the same like the input type. Rounding
>  to a given number of decimal places is supported with round(x, y) with y =
>  number of decimal places. The new function round(x, y) supports a negative
>  number of decimal places: for example, round(119, -1) results in 120, and
>  round(119, -2) results in 100.
<#secure method=pgpmime mode=sign>

Great - sounds like a perfect solution to me.

Thanks,

Rainer

-- 
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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