I want to label groups of points in the plot of residuals against predicted values generated by plot.lm(). Labelling the points by color x<-1:15 y<-rnorm(15) f<-factor(rep(c(1:3),each=5)) g<-glm(y~x) plot(g,which=1,col=c(1,2,3)[f]) I receive the error message Error in title(main, sub, xlab, ylab, line, outer, ...) : graphical parameter "col" has the wrong length How can I resolve the error? Labelling by symbols works fine plot(g,which=1,pch=c(1,2,3)[f]) And setting par(mfrow=c(1,2)) before plotting, produces the color plot without error plot(g,which=1,col=c(1,2,3)[f]) Ulrich platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status major 2 minor 3.0 year 2006 month 04 day 24 svn rev 37909 language R version.string Version 2.3.0 (2006-04-24) Ulrich Halekoh Danish Institute of Agricultural Sciences Unit of Statistics and Decision Analysis 8830 Tjele, Denmark [[alternative HTML version deleted]]
On Mon, 8 May 2006, Ulrich Halekoh wrote:> I want to label groups of points in > the plot of residuals against predicted values > generated by plot.lm(). > > Labelling the points by color > > x<-1:15 > y<-rnorm(15) > f<-factor(rep(c(1:3),each=5)) > g<-glm(y~x) > plot(g,which=1,col=c(1,2,3)[f]) > > > I receive the error message > > Error in title(main, sub, xlab, ylab, line, outer, ...) : > graphical parameter "col" has the wrong length > > How can I resolve the error?Well, the help does say ...: other parameters to be passed through to plotting functions. and it really is unclear what you intended 'col' to refer to. But as title() is not going to make use of it, it should accept it. I'll see if I can adapt it suitably. -- Brian D. Ripley, ripley at stats.ox.ac.uk 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
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