Examples

import numpy as np
import pandas as pd

def histogram_intersection(p, q):
    v = np.minimum(p, q).sum().round(decimals=1)
    return v
df = pd.DataFrame([(.3, .5), (.0, .8), (.8, .0), (.2, .1)],
                  columns=['goats', 'cows'])
df.corr(method=histogram_intersection)

	goats	cows
goats	1.0	0.4
cows	0.4	1.0