superimpose density line over hist

Hi all,

I'm trying to superimpose a rchisq density line over a histogram with
something like:

hist(alnlength)
lines(density(rchisq(length(alnlength), 4)),col="red")

But the rchisq line won't appear anywhere,

Anyone knows what I am missing here?

Following up my earlier reply, and more in line with your precise
question above:

  alnlength<-rchisq(1000,4)
  hist(alnlength,breaks=0.25*(0:100))
  j<-density(rchisq(1000,4))
  lines(j$x,1000*0.25*j$y)

Best wishes,
Ted.

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Date: 13-Dec-05                                       Time: 15:59:50
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