The main answer is to follow the examples in the book for which this is support software. (That answer is in the R posting guide, too.)
plot.lda is in the MASS namespace, and can be seen via getAnywhere() (so you can find them `anywhere'). panel.lda is defined in plot.lda. You should almost never call methods like plot.lda() directly. If you ask for help on it, you get ## S3 method for class 'lda': plot(x, panel = panel.lda, ..., cex = 0.7, dimen, abbrev = FALSE, xlab = "LD1", ylab = "LD2") Note that you are supplying default arguments. Just call plot(drug.lda, dimen = 1, type ="density") In particular, you have given a panel function for a 1D plot which does not use one. I am unable to reproduce anything like the message you got, e.g. example(z) plot(z, panel = panel.lda, cex = 0.7, dimen = 1, abbrev = FALSE, type ="density") works. Perhaps your R or MASS package is way out of date? (You haven't told us: see the R posting guide.) On Thu, 16 Jun 2005, wu sz wrote: > Hi there, > > I am a master student in Denmark, and apply R to analyze the drug data. > > I use the function 'lda' to obtain a linear discriminant object, and > then wish to use 'plot.lda' to do the plot on this object like below. > > drug.lda <- lda(Inhibition ~ NET_CHARGE + PKA_1 + MW + MLOGP, > data = drug.class, method = "moment") > > plot.lda(drug.lda, panel = panel.lda, cex = 0.7, dimen = 1, abbrev = FALSE, > type ="density") > > but I got an error message: Error: couldn't find function "plot.lda" > and then I tried > > plot(drug.lda, panel = panel.lda, cex = 0.7, dimen = 1, abbrev = FALSE, > type ="density") > > still an error message was returned: Error in plot.default(drug.lda, > panel = panel.lda, cex = 0.7, : argument 2 matches multiple formal > arguments > > Also I can't find this panel function, panel.lda anywhere. Do you know > how to use this plot function? -- 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@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html