Possible Duplicate:
Fitting a density curve to a histogram in R
x is a NAs free numeric vector.
I run:
> hist(x,density(x), prob=TRUE)
Error Message I get:
Error in rank(x, ties.method = "min", na.last = "keep") :
unimplemented type 'list' in 'greater'
It was suggested that I set prob =TRUE when calling hist. If you can explain that as well, it will be great. Thank you.
You need to call hist and density separately. Something like this:
hist(x, prob=TRUE)
lines(density(x))
来源：https://stackoverflow.com/questions/12945951/how-to-plot-a-density-estimate-on-top-of-the-histogram