How to calculate upper and lower values of bins of equal density histogram?

Question

I have a range of positive integers ranging from 250-1200, with a normal distribution. I have found the answer to creating bins of equal density (Matplotlib: How to make a histogram with bins of equal area?). What I am actually looking for is to be able to retrieve the upper and lower boundaries of each bin. Is there a library/function that exists for this? or can this information be pulled out from matplotlib?

Answer 1

Let's take a look at the code provided in the question you linked:

def histedges_equalN(x, nbin):
    npt = len(x)
    return np.interp(np.linspace(0, npt, nbin + 1),
                     np.arange(npt),
                     np.sort(x))

x = np.random.randn(1000)
n, bins, patches = plt.hist(x, histedges_equalN(x, 10))

bins is actually giving you the edges of each bin as you can read in the docs of hist function: