[R] superimposing histograms con't

From: Bill Shipley <bill.shipley_at_usherbrooke.ca>
Date: Thu 29 Jun 2006 - 05:53:35 EST


Earlier, I posted the following question: 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
- a single x axis (from -3 to 18)

Gabor Grothendieck [ggrothendieck@gmail.com] pointed to some code to to this but I have found another way that works even easier.  

hist(x[sel1],xlim=c(a,b),ylim=c(A,B)) - this plots the histogram for the first group (indexed by sel1) but with an x axis and a y axis that spans the entire range.  

par(new=T) - to keep on the same graph  

hist(x[sel2],main=Null,xlab=NULL,ylab=NULL,axes=F) -superimposes the second histogram  

par(new=T) - to keep on the same graph  

hist(x[sel3],main=Null,xlab=NULL,ylab=NULL,axes=F) -superimposes the third histogram    

Bill Shipley

North American Editor, Annals of Botany

Editor, "Population and Community Biology" series, Springer Publishing

Département de biologie, Université de Sherbrooke,

Sherbrooke (Québec) J1K 2R1 CANADA

Bill.Shipley@USherbrooke.ca

http://callisto.si.usherb.ca:8080/bshipley/    

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