Hi
I want to change a control parameter for an nls () as I am getting an error
message "step factor 0.000488281 reduced below 'minFactor' of 0.000976562".
Despite all tries, it seems that the control parameter of the nls, does not
seem to get handed down to the function itself, or the error message is
using a different one.
Below system info and an example highlighting the problem.
Thanks,
Rainer
> version _
platform i486-pc-linux-gnu
arch i486
os linux-gnu
system i486, linux-gnu
status
major 2
minor 9.2
year 2009
month 08
day 24
svn rev 49384
language R
version.string R version 2.9.2 (2009-08-24)
> sessionInfo()
R version 2.9.2 (2009-08-24)
i486-pc-linux-gnu
locale:
LC_CTYPE=en_ZA.UTF-8;LC_NUMERIC=C;LC_TIME=en_ZA.UTF-8;LC_COLLATE=en_ZA.UTF-8;LC_MONETARY=C;LC_MESSAGES=en_ZA.UTF-8;LC_PAPER=en_ZA.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_ZA.UTF-8;LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] R.utils_1.2.0 R.oo_1.5.0 R.methodsS3_1.0.3 maptools_0.7-26
[5] sp_0.9-44 foreign_0.8-37
loaded via a namespace (and not attached):
[1] grid_2.9.2 lattice_0.17-25
#############################################
EXAMPLE:
dat <- data.frame(
x = 2006:2037,
y = c(143088, 140218, 137964,
138313, 140005, 141483, 142365,
144114, 145335, 146958, 148584,
149398, 151074, 152241, 153919,
155580, 157258, 158981, 160591,
162126, 163743, 165213, 166695,
168023, 169522, 170746, 172057,
173287, 173977, 175232, 176308,
177484)
)
nls( y ~ SSlogis(x, Asym, xmid, scal), data = dat, trace=TRUE)
(newMinFactor <- 1/(4*1024))
nls( y ~ SSlogis(x, Asym, xmid, scal), data = dat,
control=nls.control(minFactor=newMinFactor), trace=TRUE)
nls( y ~ SSlogis(x, Asym, xmid, scal), data = dat,
control=c(minFactor=newMinFactor), trace=TRUE)
(newMinFactor <- 4/1024)
nls( y ~ SSlogis(x, Asym, xmid, scal), data = dat,
control=nls.control(minFactor=newMinFactor), trace=TRUE)
nls( y ~ SSlogis(x, Asym, xmid, scal), data = dat,
control=c(minFactor=newMinFactor), trace=TRUE)
--
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology,
UCT), Dipl. Phys. (Germany)
Centre of Excellence for Invasion Biology
Natural Sciences Building
Office Suite 2039
Stellenbosch University
Main Campus, Merriman Avenue
Stellenbosch
South Africa
Cell: +27 - (0)83 9479 042
Fax: +27 - (0)86 516 2782
Fax: +49 - (0)721 151 334 888
email: rai...@krugs.de
Skype: RMkrug
Google: r.m.k...@gmail.com
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