R help - Oct 2008 - plot the chi square distribution and the histogram in the same graph

In the previous post ,i ask how to plot the  normal curve and the histogram
in the same graph.if i want to know how to plot the chi square distribution
to campare the data set ,how can i do that?
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leo_wa wrote:
> In the previous post ,i ask how to plot the  normal curve and the histogram
> in the same graph.if i want to know how to plot the chi square distribution
> to campare the data set ,how can i do that?
>   
You should make up your mind, is your random variable X (-inf,+inf) or 
Sum(X^2) (which obviously cann't take negative values)?
They are quite different.
Rub?n