R help - Oct 2011 - How to change the scale of the Y axis?

I am currently trying to create 3 histograms from 3 sets of data and in order
to compare them I need them all to have a common scale, the Y axis is the
only place its a problem, as one histogram only goes up to 4, another 5, and
another 7 on the Y axis and obviously they all need to be in the same scale
to allow comparisons. Can anyone help?

Thanks,
Feargal

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feargalr wrote:
> 
> I am currently trying to create 3 histograms from 3 sets of data and in
> order to compare them I need them all to have a common scale, the Y axis
> is the only place its a problem, as one histogram only goes up to 4,
> another 5, and another 7 on the Y axis and obviously they all need to be
> in the same scale to allow comparisons. Can anyone help?
> 
> Thanks,
> Feargal
> 

The ylim option in the hist function should do what you need ....

A simple example with 2 sets of data ....

# Create Data
set.seed(123)
d1 = 7*rnorm(100)
d2 = runif(100)

par(mfrow = c(2,1))
hist(d1, ylim=c(0,50))
hist(d2, ylim=c(0,50))

HTH

Pete

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