[R] how to plot two histograms overlapped in the same plane coordinate

[Barry Rowlingson]

On Fri, Jul 9, 2010 at 2:29 PM, Mao Jianfeng <jianfeng.mao at gmail.com> wrote:
> Dear R-help listers,
>
> I am new. I just want to get helps on how to plot two histograms
> overlapped in the same plane coordinate. What I did is very ugly.
> Could you please help me to improve it? I want to got a plot with semi-
> transparent overlapping region. And, I want to know how to specify the
> filled colors of the different histograms.
>
> I also prefer other solutions other than ggplot2.
>
> Many thanks to you.
>
>
> What I have done:
>
> library(ggplot2)
>
> age<-c(rnorm(100, 1.5, 1), rnorm(100, 5, 1))
> sex<-c(rep("F",100), rep("M", 100))
> mydata<-cbind(age, sex)
> mydata<-as.data.frame(mydata)
> head(mydata)
>

 Tried setting xlim with hist?

 par(mfrow=c(2,1))
 hist(age[sex=="M"],xlim=range(age))
 hist(age[sex=="F"],xlim=range(age))

Barry