There is a reproducible example in the MASS survival chapter. I've reported this to the survival maintainer more than once: it's a partial matching problem.
On Sat, 24 Nov 2007, Ben Bolker wrote: > > > > makis motakis-2 wrote: >> >> Hi all, >> >> I have installed in R 2.6 the survival package and I am trying to analyze >> some >> data and present plots. The problem occurs when I try to plot lines on >> the same plot. E.g. take simulated data for time (t), event (e) and groups >> (group1 and group2) and do: >> >> ### this is how I create the plots >> plot1<-survfit(Surv(t,e)~ as.factor(group1)) >> plot2<-survfit(Surv(t,e)~ as.factor(group2)) >> >> plot(plot1) >> lines(plot2,type="s") >> Error in rep(2, n2 - 1) : invalid 'times' argument >> >> The plot is created (plot1) but the lines (plot2) are not. I have run this >> same program >> several times from my previous pc (R 2.4 was installed)and I never had >> such a problem. >> Now suddenly this error message appears and it concerns only the survival >> package (I mean >> for simple plots there is no problem to plot lines in an existing plot). >> Is there a problem >> with R 2.6 on this matter? Can someone please help? >> >> > > Don't know ... a simple reproducible example would help ... > > (Some really really trivial things I tried worked, for example: > > z = rexp(100) > f1 = factor(rep(1:5,each=20)) > f2 = factor(rep(1:2,each=50)) > event = rep(1,100) > library(survival) > s1 = survfit(Surv(z,event)~f1) > s2 = survfit(Surv(z,event)~f2) > plot(s1) > lines(s2,col=2,type="s") > >> sessionInfo() > R version 2.6.0 (2007-10-03) > i486-pc-linux-gnu > > locale: > LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=en_US.UTF-8;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFICATION=C > > attached base packages: > [1] splines stats graphics grDevices utils datasets methods > [8] base > > other attached packages: > [1] survival_2.34 > > Ben Bolker > > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
