[R] Re flect Back to Back Histograms in x-axis?

[sedm1000]

Thanks very much for that, most useful...



Ted.Harding-2 wrote:
> 
> On 08-Jun-09 13:11:03, sedm1000 wrote:
>> I've looked long and hard for this, but maybe I am missing something...
>> 
>> There is a nice module that displays histograms reflected in the
>> y axis, i.e.
>> http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=136
>> 
>> but is it possible to reflect in the x-axis, so to have two datasets,
>> one pointing up and one down rather than left and right? I haven't
>> been able to find a way to plot this way using the guide, or elsewhere.
>> 
>> Thanks...
>> -- 
> 
> Try along the lines of:
> 
>   set.seed(54321)
>   X1 <- rnorm(500)
>   X2 <- rnorm(500)
>   H1 <- hist(X1,breaks=0.5*((-8):8),ylim=c(-100,100))
>   H1 <- hist(X1,breaks=0.5*((-8):8),ylim=c(-100,100),col="red")
>   H2 <- hist(X2,breaks=0.5*((-8):8),plot=FALSE)
>   H3<-H2 ; H3$counts <- -H3$counts
>   plot(H3,add=TRUE,col="blue")
> 
> NB: The choice of breaks and ylim was made after a preliminary
> inspection of hist(X1) and hist(X2).
> 
> Ted.
> 
> --------------------------------------------------------------------
> E-Mail: (Ted Harding) <Ted.Harding at manchester.ac.uk>
> Fax-to-email: +44 (0)870 094 0861
> Date: 08-Jun-09                                       Time: 15:50:48
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