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

[John Kane]

I don't think that you're actually creating a
scatterplot if the x-axis is a factor.  You're getting
a boxplot.

If you want a scatterplot then something like this
might work.
======================================================

means<-c(4,6,8)
stand.error<-c(0.1,0.3,0.5)

aa <- factor(c("A","B","C","A", "C", "C"))
dd <- 1:length(levels(aa))

plot(dd, means, xaxt="n") 
arrows(dd, means + stand.error, dd, means-stand.error,
          code=3, angle=90)
axis(1, at=dd, labels=levels(aa))

=======================================================

--- Giacomo Prodi <bonoricus at yahoo.it> 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)
> 
> 
> 
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