Hi all Can anybody help me with this? I am trying to include in an automatic way the argument in arg.names in a barplot. I generate the labels I want to appear below the bars with a for loop, and they contain subscripts, so I need to use expression
anch<-0.05 esp<-4 for (i in 1:dim(Ntot)[1]) { naux<-Ntot[i,] naux2<-naux[naux>0] nind<-which(naux>0) tit4<-character(0) for (j in 1:length(nind)) { tit4<-c(tit4,paste("expression(n[paste[",i,",",nind[j],"])",sep="")) } windows() barplot(naux2,xlab=eval(expression(substitute(n[i],list(i=i)))), arg.names=tit4,col="gray",width=c(anch,anch),axes=TRUE,xlim=c(0,anch*(esp+2)*length(nind)), space=esp,ylim=c(0,max(naux2)),main=paste("State #",i),yaxp=c(0,M,Mint));lines(c(0,100),c(0,0)) } # end of for but I don't get what I expect. R plots literally the contents of tit4 below each bar, i.e., (for the last value of i in the outer for loop) "expression(n[paste[5,1])" "expression(n[paste[5,2])" "expression(n[paste[5,3])" "expression(n[paste[5,4])" Of course, if I write directly arg.names=c(expression(n[paste(5,1)]),expression(n[paste(5,2)]),expression(n[paste(5,3)]),expression(n[paste(5,4)])) it works, but then I cannot do ii in an automatic way for all the graphics coming from the for (i in 1:dim(Ntot)[1]). I have also tried to store in another variable tit5 the whole expression as > tit5 [1] "c(expression(n[paste[5,1]),expression(n[paste[5,2]),expression(n[paste[5,3]),expression(n[paste[5,4]))" but it doesn't work neither I wonder if there is some way that barplot "tells" arg.names to "evaluate" the contents of tit4 as expressions, not as characters I hope I made myself clear enough Thanks in advance to any response Cheers!!!! Javi -- View this message in context: http://www.nabble.com/How-to-pass-a-character-argument-which-contains-expressions-to-arg.names-in-barplot--tp24630656p24630656.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.