harmonic mean in python

Question

The Harmonic Mean function in Python (scipy.stats.hmean) requires that the input be positive numbers.

For example:

from scipy import st         


        

Answer 1

You can just use the Harmonic Mean define equation:

len(a) / np.sum(1.0/a) 

But, wikipedia says that harmonic mean is defined for positive real numbers:

http://en.wikipedia.org/wiki/Harmonic_mean