Dear all, I have a data.frame like below and I need to plot horizonal with error bar only for upper limit. On the code below I am able to plot the bars within groups, but I need (1) change from vertical to horizonal plot and (2) add the error bar. any hint are welcome. milton ---- mydf<-read.table(stdin(),head=T,sep=",") mygroup,xlabel,yvalue,error Gr1,Bar1,1,0.5 Gr1,Bar2,2,0.7 Gr1,Bar3,2,1.0 Gr1,Bar4,2.5,0.5 Gr2,Bar1,1,2 Gr2,Bar2,1,1 Gr2,Bar3,3,1 Gr2,Bar4,4,0.5 require(lattice) barchart(yvalue~xlabel|mygroup, data=mydf) [[alternative HTML version deleted]]