[R] Performance note: Preallocating helps? and two questions

Bob Sandefur rls at pincock.com
Wed Nov 1 15:00:41 CET 2000

 in r 1.1 on windows 2000
 with length(AU) of 35833
 for(i in 1:length(AU))AUcap30[i]<-min(30,AU[i]) 
took over an hour on pentium II 300 mhertz (I esc'ed before it finished)
 for(i in 1:length(AU))AUcap30[i]<-min(30,AU[i]) 
is very quick (a few seconds)

Is this performance difference common in r (ie is linux the same way)?

Are there other tricks to speed up R (in windows) (besides a faster processor and more memory)?


bob sandefur

Principal Geostatistician
Pincock Allen & Holt
International Minerals Consultants
274 Union Suite 200
Lakewood CO 80228
303 914-4467  v
303 987-8907 f

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