Re: [R] Can't add error bars to existing line graph

Hi Bruno, The interaction.plot function plots the _levels_ of the x.factor argument, not the values of the variable that is coerced to a factor. This means that the temperature locations on the x axis are c(1,2), not c(12,17). The code below works for me: readscaphfileNEW<-read.table(text="EXPERIM

Re: [R] Can't add error bars to existing line graph

Dear Bruno, There are (at least) two errors here: (1) I think that you misunderstand how interaction.plot(), and more generally R base graphics, work. interaction.plot() doesn't return a graphics object, but rather draws on a graphics device as a side effect. Of course, interaction.plot() is

[R] Can't add error bars to existing line graph

Hi all, I'm trying to add error bars to an existing line graph in base R. The basic line graph comes up just fine, but it does not show my error bars... Data frame = readscaphfileNEW Plot name = SCAPHLINEGRAPHNEW x axis = TEMP y axis = SCAPH.BPM Tracer = Year (SAME AS 'EXPERIMENT) Scaphmeans =