Hi Anjan,

Try something along the lines of

d$bb <- with(d, cut(b, c(0,9,19,29)))
with(d, plot(a, id, col = bb, pch = 16, las = 1))
legend('topright', as.character(levels(d$bb)), col = 1:length(levels(d$bb)),
ncol = 3, pch = 16)

where 'd' is your original data.frame.

HTH,
Jorge


On Wed, Jan 5, 2011 at 2:00 PM, ANJAN PURKAYASTHA <> wrote:

> 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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>
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