sciPy stats.hmean() | Python (original) (raw)

Last Updated : 7 Feb, 2019

**scipy.stats.hmean(array, axis=0, dtype=None)** calculates the harmonic mean of the array elements along the specified axis of the array (list in python). It's formula -

Parameters : array: Input array or object having the elements to calculate the harmonic mean. axis: Axis along which the mean is to be computed. By default axis = 0 dtype: Optional. It sets the type of returned element. Returns : Harmonic mean of the array elements based on the set parameters.

Code #1:

Python3 1== `

Harmonic Mean

from scipy.stats.mstats import hmean arr1 = hmean([1, 3, 27])

print("Harmonic Mean is :", arr1)

`

Output:

Harmonic Mean is : 2.18918918919

Code #2: With multi-dimensional data

Python3 1== `

Harmonic Mean

from scipy.stats.mstats import hmean arr1 = [[1, 3, 27], [3, 4, 6], [7, 6, 3], [3, 6, 8]]

print("\nHarmonic Mean is :", hmean(arr1))

using axis = 0

print("\nHarmonic Mean is with default axis = 0 : \n", hmean(arr1, axis = 0))

using axis = 1

print("\nHarmonic Mean is with default axis = 1 : \n", hmean(arr1, axis = 1))

`

Output:

Harmonic Mean is : [ 2.21052632 4.36363636 6.04195804]

Harmonic Mean is with default axis = 0 : [ 2.21052632 4.36363636 6.04195804]

Harmonic Mean is with default axis = 1 : [ 2.18918919 4. 4.66666667 4.8 ]