[R] Plotting colour-coded points

[David Winsemius]

On 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?

Something along the lines of this code:

plot(a ~ id, data=dfrm,
         col=c("red", "green", "blue")[findInterval(dfrm$b,  
c(0,10,20,30) )] )
-- 
David.




> 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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David Winsemius, MD
West Hartford, CT