[R] hello! i need help for a specific graphic issue

[Giacomo Prodi]

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)



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