Histograms on same scale

[<Andre.Mery@aventis.com>]

Hi,

 

I am just drawing 2 histograms side by side (using par(mfrow = c(1,2)). The highest class of the 1st one is up to 24, although the highest class of the 2nd one is up to 20. So, the y-axis of the 1st one goes up to 24, although the y-axis of the 2nd one goes up only to 20.

 

In order to have a nice visual comparison between these 2 plots, how can I force the y-axis of the 2nd one to be plotted up to 24? I couldn't get the proper instruction.

 

Thanks for any help.

 

 

André Méry
Aventis Pharma
20, avenue Raymond Aron - 92160 Antony
[Courrier / Mail : Tri B2/13]
[Tél. / Tel. : 01 55 71 68 69]