Dot plot of character and numeric matrix

I think you need to become more familiar with the "factor" data type. Reread the Introduction to R document that comes with R.
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Dear List,

I have a set of data which looks like this (small set of sample)

A A	0.431
A A	0.439
A A	0.507
A G	0.508
A A	0.514

I will like to use this data to plot a dot plot, with the X-axis being
of type character, and my y axis of type numeric.

When I try to use the dot chart function, I get the error message "'x'
must be a numeric vector or matrix", which I can understand it to be a
result of the fact that I have characters AA, AG etc as my x-values.

Any idea how I can go about doing this?

Thanks in advanced!
Jeremy
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