[GRASS-stats] Heuristic assignment of NODATA value in package spgrass6

[Rainer M Krug]

On Fri, Aug 1, 2008 at 6:50 PM, Roger Bivand <Roger.Bivand at nhh.no> wrote:
> On Fri, 1 Aug 2008, Rainer M Krug wrote:
>
>> I am confronted with the situation where a raster in grass has only
>> NULL values.
>> As I am using grass and R to do simulations, this can happen under
>> certain situations.
>> I am doing calculations with these layers also in R ands consequently
>> I am loading these layers with readRAST6(). But when all values are
>> NULL in the raster, I get an error message:
>>
>>
>>> readRAST6("HSericea_seedsDisperse_2007")
>>
>> ERROR: Invalid value for null (integers only)
>> Error in readBinGrid(rtmpfl11, colname = vname[i], proj4string = p4,
>> integer = to_int) :
>> no such file:
>>
>> /home/rkrug/Documents/Projects/AlienSpread/R/../grass/simulation/.tmp/ecolmod/HSericea_seedsDisperse_2007
>>
>> I would therefore suggest that in this case, an arbitrary value is
>> assigned to the NODATA  argument to avoid this error.
>
> Please try the draft on the sourceforge r-spatial site, module spgrass6,
> file R/bin_link.R, and let me know if it works, it seems to for me.

Thanks for the prompt reply.

Sorry for being a little bit dumb today, but do you mean from the cvs?
Otherwise I don't know where to look.

>
> Roger
>
>>
>> Thanks
>>
>> Rainer
>>
>>
>>
>
> --
> Roger Bivand
> Economic Geography Section, Department of Economics, Norwegian School of
> Economics and Business Administration, Helleveien 30, N-5045 Bergen,
> Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
> e-mail: Roger.Bivand at nhh.no
>
>



-- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
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