Dear R-lister

I have a question about how to create multiple error bar plots.
I found that I can use an "errbar" function from Hmisc package to create one
error bar plot in which there are multiple data points (x, y) with the error
bars. Thus, I know that I can get "one" error bar plot which consists of
many data points. However, I did not find a way to put "multiple" error bar
plots into one.

In my data, x represents a group index and y represents some measurements. I
have three sets of measurements all of which have the same group indices
(thus the same x values in the errbar plot).
In other words, my data looks like this:
X1 (group index), Y11 (measurement), error of Y11 (error in measurement)
X2, Y21, error of Y21
...
Xn, Yn1, error of Yn1 // End of the first set of measurements

X1, Y12, error of Y12,
X2, Y22, error of Y22,
...
Xn, Yn2, error of Yn2 // End of the second set of measurements

X1, Y13, error of Y13,
X2, Y23, error of Y23,
...
Xn, Yn3, error of Yn3 // end of the third set of measurements

I need to put one errbar plot that include all three cases with different
symbols for each data set. How can I do this?

Thanks in advance.

Youngjin

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