quick (and dirty) solution: y.up<- means+stand.error y.dwn<- means-stand.error
plot(means,ylim=c(3.5,10)) for (i in 1:length(means)) arrows(i,means[i],i,y.up[i],length=0.1) for (i in 1:length(means)) arrows(i,means[i],i,y.dwn[i],length=0.1) Giacomo Prodi wrote: > > hello, ladyes and gentlemans. > > check this: > > means<-c(4,6,8) > stand.error<-c(0.1,0.3,0.5) > > now i've strongly tryed to scatterplot the > means(y-axis),by showing their sd with the > arrow(..,code=3,angle=90) function. > The problem is that my x-axis has categorical values > (say, factor(x)), and the arrows() can't recognize > them as right coordinates. > ????? > thank you all in advance > B.F. insubria university (varese) > > > > La web mail più usata al mondo. > http://it.docs.yahoo.com/mail/overview/index.html > > ______________________________________________ > 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. > > -- View this message in context: http://www.nabble.com/hello%21-i-need-help-for-a-specific-graphic-issue-tp16002183p16002532.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.