Plot histogram and density function curve on one chart

Question

I have a density function f, and I do MCMC sampling for it. To evaluate the goodness of the sampling, I need to plot the hist and curve within the same chart. The problem of

hist(samples);
curve(dfun,add=TRUE);

is that they are on the different scale: the frequency of a certain bin is usually hundreds, while the maximum of a density function is about 1 or so. What I want to do is to configure two plots at the same height, with one y-axis on the left and the other on the right. Can anyone help? Thank you.

Answer 1

Use the prob=TRUE argument to hist:

hist(samples, prob=TRUE)
curve(dfun,add=TRUE)

Also see this SO question