On Mon, 16 Jun 2008, Wacek Kusnierczyk wrote:
Paul Adams wrote:Hello everyone, I have the following code which keeps giving me an error. The code is: dat<-read.table(file="C:\\Documents and Settings\\Owner\\My Documents\\eisen.txt",header=T,row.names=1,blank.lines.skip=F,na..strings="NA") dimnames(dat)((1)) <-as.character(dat(,1)) dat<-dat(,-1) dat<-as.data.frame(dat) file.show(file="C:\\Documents and Settings\\Owner\\My Documents\\eisen.txt") ann<-read.table(file="C:\\Documents and Settings\\Owner\\My Documents\\eisenClasses.txt",header=T) file.show(file="C:\\Documents and Settings\\Owner\\My Documents\\eisenClasses.txt") cl<-as.character(ann[,2]) dat<-dat[,cl] gc<-cl(1:19) act<-cl(20:39) x<-as.numeric(dat(2000,gc)) y<-as.numeric(dat(2000,act)) x<-x(!is..na(x)) y<-y(!is.na(y)) xy.list<-list(x,y) boxplot(xy.list,col=c("red","blue"),main="Gene 2000") The error is: "error in eval .with.vis(expr, envir, enclos) : could not find function "dat"you misuse the syntax, check the docs. with 'dat(...)' r tries to apply dat, but dat is a data frame, and is thus not applicable. what you want is dat[...]. you can argue that the error message is misleading; unless you defined one, r cannot find a function named 'dat', but it does find your data frame, and it should complain about its non-applicability.
It is this explanation which is misleading. R (not r) looks for a function named 'dat': it does not find the data frame when looking for a function. To be explicit, when R encounters foo() it looks in the current environment for a function named 'foo' and ignores all other objects named 'foo' even if they are higher on the search path. This was not the behaviour of Blue-Book S, but it has been the behvaviour of S and R for many years.
-- 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 ______________________________________________ [email protected] 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.
