Pertanyaan python

'''
Created on Mar 26, 2015

@author: Majesty Eksa Permana
'''
import numpy as np
from scipy.spatial.distance import mahalanobis
s = np.array([[20, 30, 50], [123, 10, 12], [80, 113, 50], [40, 103, 20], [20, 40, 123]])
std = s.std()
cov = np.cov(s, rowvar = 0)
invcovar = np.linalg.inv(cov)

hasil =np.array([])
for i in range(len(s)):
    for j in range(len(s)-1):
        hasil = mahalanobis(s[i], s[j+1], invcovar)
        if j == len(s)-j:
            break
        print hasil

Tetapi hasilnya seperti ini pak :

2.40909729452
2.82393911094
1.71946702793
2.20464677556
0.0
2.50009183937
2.72334982816
2.81353148752
2.50009183937
0.0
1.90960116607
2.32368727371
2.72334982816
1.90960116607
0.0
2.78844612204
2.81353148752
2.32368727371
2.78844612204
0.0