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

From: Giacomo Prodi <bonoricus_at_yahoo.it>
Date: Wed, 12 Mar 2008 11:37:25 +0100 (CET)

hello, ladyes and gentlemans.

check this:


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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