scipy.stats.variation(arr, axis = None)函數計算變異系數。定義為標準偏差與平均值之比。

參數：

arr :[數組]輸入數組。

axis :[int或int元組]軸，我們要沿著該軸計算變異系數。

->軸= 0沿列的變化系數。

->軸= 1沿行工作的變化系數。

結果：沿指定軸具有值的數組變化系數。

代碼1：使用variation()

from scipy.stats import variation

import numpy as np

arr = np.random.randn(5, 5)

print ("array : \n", arr)

# rows: axis = 0, cols: axis = 1

print ("\nVariation at axis = 0: \n", variation(arr, axis = 0))

print ("\nVariation at axis = 1: \n", variation(arr, axis = 1))

輸出：

array :

[[-1.16536706 -1.29744691 -0.39964651 2.14909277 -1.00669835]

[ 0.79979681 0.91566149 -0.823054 0.9189682 -0.01061181]

[ 0.9532622 0.38630077 -0.79026789 -0.70154086 0.79087801]

[ 0.53553389 1.46409899 1.89903817 -0.35360202 -0.14597738]

[-1.53582875 -0.50077039 -0.23073327 0.32457064 -0.43269088]]

Variation at axis = 0:

[-12.73042404 5.10272979 -14.6476392 2.15882202 -3.64031032]

Variation at axis = 1:

[-3.73200773 1.90419038 5.77300406 1.29451485 -1.27228112]

代碼2：如何在沒有variation()的情況下實現

import numpy as np

arr = np.random.randn(5, 5)

print ("array : \n", arr)

# this function works similar to variation()

cv = lambda x: np.std(x) / np.mean(x)

var1 = np.apply_along_axis(cv, axis = 0, arr = arr)

print ("\nVariation at axis = 0: \n", var1)

var2 = np.apply_along_axis(cv, axis = 1, arr = arr)

print ("\nVariation at axis = 0: \n", var2)

輸出：

array :

[[ 0.51268414 -1.93697931 0.41573223 2.14911168 0.15036631]

[-0.50407207 1.51519879 -0.42217231 -1.09609322 1.93184432]

[-1.07727163 0.27195529 -0.1308108 -1.75406388 0.94046395]

[ 1.23283059 -0.03112461 0.59725109 0.06671002 -0.97537666]

[ 1.1233506 0.97658799 -1.10309113 -1.33142901 -0.28470146]]

Variation at axis = 0:

[ 3.52845174 7.40891024 -4.74078192 -3.57928544 2.85092056]

Variation at axis = 0:

[ 5.04874565 4.22763514 -2.74104828 4.10772935 -8.24126977]

總結

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