Re: [R] Transparent colors OR two series on one histogram

From: Thomas Lumley <tlumley_at_u.washington.edu>
Date: Fri 11 Mar 2005 - 07:41:07 EST

On Thu, 10 Mar 2005, Nathaniel Street wrote:

> Hi,
>
> I want to be able to plot a single histogram of a measured trait with trait
> values from two conditions on the same histogram to allow easy comparison.
>
> I have previously done this in excel by plotting the two series on a single
> bargraph having calculated frequencies in bins. You then get one condition
> plotted immediately to the right of the other. I hope that makes sense?
>
> I don't know if this is possible in R?

You can do it for bar plots, but not for histograms. Look at barplot(beside=TRUE)

> If not, I could plot the second one on top of the first i.e.
>
> hist(x)
> hist(y,add=TRUE)
>
> but i would need to set one as having a semi-transparent color so that where
> the two sets of are plotted on top of each other, you can see the frequency
> of the first series 'behind' the second.

Semitransparent colors are available for the pdf() and quartz() devices. They were described by Paul Murrell in R News Vol 4 No 2.

         -thomas



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