[R] R crashes when spherical autocorrelation specified in nlme

From: Dan Bebber <danbebber_at_yahoo.co.uk>
Date: Thu 07 Jul 2005 - 23:10:29 EST


Dear list:
R crashes when I specify spatial autocorrelation in nlme:

sp3 <- corSpher(c(30,0.75),~x+y|Site, nugget = T) cs3 <- Initialize(sp3, data = sav)
sav.nlme1<-nlme(vc.asin ~ SSasymp(canopy, Asym, R0, lrc),data = sav, fixed = Asym + R0 + lrc ~ 1, random = R0 + lrc ~ 1|Site, start = list(fixed = sav.ini), verbose = T, correlation = cs3)

There is a longish (~3 s) pause prior to the crash. There is no crash if "correlation = cs3" is omitted. The nugget effect is large (~0.75), so perhaps it is not worth including, but I would still like to know if the crash can be avoided.

My system is:
R 2.0.1
Windows XP SP2
Dual Intel Xeon 2.8GHz
2Gb RAM

Thanks,
Dan Bebber

Department of Plant Sciences
University of Oxford
UK



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