[R-sig-Geo] Not so random sampleRandom in raster package

Tom Gottfried tom.gottfried at tum.de
Fri Feb 10 08:00:46 CET 2012


Edzer,

Am 09.02.2012 17:58, schrieb Edzer Pebesma:
>
>
> On 02/09/2012 05:02 PM, Etienne B. Racine wrote:
>> It seems that sampleRandom isn't so random.
>>
>> # try this :
>> library(raster)
>> r<- raster(matrix(1:25, 5, 5))
>> sampleRandom(r, 25)
>> ## 1 6 11 16 21 2 7 12 17 22 3 8 13 18 23 4 9 14 19 24 5 10 15
>> sampleRandom(r, 25)
>> ## 1 6 11 16 21 2 7 12 17 22 3 8 13 18 23 4 9 14 19 24 5 10 15
>>
>> I haven't seen any documentation about this behavior.
>>
>
> Isn't the more important question whether you saw documentation that is
> in conflict with this behaviour?

taking that to the extremes: undocumented software always works perfectly.

(By the way I've heard that's the way ESRI did it with their 
"Geostatistical Analyst")

Sorry for missing the topic of the thread.
Tom

>
>>
>> 	[[alternative HTML version deleted]]
>>
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo at r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>

-- 
Technische Universität München
Department für Pflanzenwissenschaften
Lehrstuhl für Grünlandlehre
Alte Akademie 12
85350 Freising / Germany
Phone: ++49 (0)8161 715324
Fax:   ++49 (0)8161 713243
email: tom.gottfried at wzw.tum.de
http://www.wzw.tum.de/gruenland



More information about the R-sig-Geo mailing list