Plot Histogram in R:

Method 1: hist(vector, breaks)

Take care for the parameter “breaks”:

according the help:

breaks: a single number giving the number of cells for the histogram.

Important: the number is a suggestion only! The breakpoints will be set to pretty values.

For example:

>data(“women”) #load dateset “women”

> hist(women$weight, breaks = 7)

If you want to have exact 7 bins, you should specify the position

>hist(women$weight, breaks=seq(min(women$weight), max(women$weight), l = 7))

so, you will get the exact 7 bins