How do I plot the densities from a histogram?
So I want to do something like this in R:
x <- rnorm(1000, 100, 50)
h <- hist(x, breaks="fd")
z <- plot(h$breaks, h$density)
The problem is that the $breaks field in the histogram has one more value than the $density field? is there an easy way around 开发者_运维问答this problem?
Turns out all I needed to do was to set the freq
field to FALSE
So I just did hist(rnorm(1000, 100, 50), freq="FALSE")
and that did a histogram of relative frequencies.
I'm not sure exactly what the problem is, but you could just drop either the first or last element of h$breaks
to plot the points at either endpoint, or you could drop the last element and then add half the bin width to plot them at the midpoints:
plot(h$breaks[-length(h$breaks)] + 5, h$density)
That just fixes your specific problem, though. There may be a better way of using hist
in general, if you expanded on what you're trying to do a bit.
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