[R] superimposing histograms

From: Bill Shipley <bill.shipley_at_usherbrooke.ca>
Date: Thu 29 Jun 2006 - 04:09:02 EST

I want to superimpose histograms from three populations onto the same graph, changing the shading of the bars for each population. After consulting the help files and the archives I cannot find out how to do this (seemly) simple graph. To be clear, I want  

Can anyone explain how to do this?  


Bill Shipley    

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