[R] two histograms in the same graph

Domenico Vistocco vistocco at unicas.it
Fri Jan 25 21:04:56 CET 2008

You could use ggplot2:

#for "vertical" histogram
#for "horizontal" histogram  
ggplot(data=df,aes(x=value))+geom_histogram()+facet_grid(.~variable) + 


David Daniel wrote:
> You might look at the method histbackback (back-to-back histograms) in  
> package Hmisc.  At the time I looked at this package about a year ago,  
> I could not get it working on my Mac, so I don't actually know what  
> the results look like, but I have created them before in XLispStat and  
> found them useful.  From posts I've seen more recently, I believe that  
> whatever the problem I was encountering previously on the Mac has been  
> resolved.
> -David
>> I have two vectors x and z, and I want to display the histograms of  
>> both
>> vectors in the same graph, x in red bars, z in blue bars.
>> If you have any clue on how to do that, I will be very glad to hear  
>> it!!!!!!
>> Thanks in advance again,
> ----------------------------------
> David Daniel
> Associate Professor
> University Statistics Center
> New Mexico State University
> ddaniel at nmsu.edu
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