Full_Name: Hendrik Weisser Version: 2.6.1 OS: Linux Submission from: (NULL) (139.19.102.218)
The following computation never finishes and locks R up: > values <- list(x=10:30, y=c(23.85, 28.805, 28.195, 26.23, 25.005, 20.475, 17.33, 14.97, 11.765, 8.857, 5.3725, 5.16, 4.2105, 2.929, 2.174, 1.25, 1.0255, 0.612, 0.556, 0.4025, 0.173)) > y.max <- max(values$y) > model <- nls(y ~ SSlogis(x, asym, xmid, scal), data=values, algorithm="port", start=c(asym=y.max, xmid=15, scal=-0.5), upper=c(y.max, Inf, Inf)) This used to work with R version 2.5.1 patched. The problem does _not_ occur if the parameter "scal=-0.5" in the nls call is changed, e. g. to "scal=-0.6" or "scal=-0.4". Simply calling "model <- nls(y ~ SSlogis(x, asym, xmid, scal), data=values)" also works, but this does not use the upper bound for the asym parameter, which was the point. ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
