Hi,
I have a file of the following type:

id    a        b
1   0.5       5
2   0.7      15
3   1.6       7
4    0.5     25
....................

I would like to plot the data in column a on the y-axis and the
corresponding data in column id on the x-axis, so plot(a~id).  However I
would like to colour these points according to the data in column b.
column b data may be colour coded into the following bins: 0-9; 10-19;
20-29.
Any idea on how to accomplish this?
TIA,
Anjan

-- 
===================================
anjan purkayastha, phd.
research associate
fas center for systems biology,
harvard university
52 oxford street
cambridge ma 02138
phone-703.740.6939
===================================

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