Python numpy.percentile()用法及代碼示例

numpy.percentile()函數用於計算沿指定軸的給定數據(數組元素)的第n個百分點。

用法：numpy.percentile(arr, n, axis=None, out=None)

參數:

arr :input array.

n   : percentile value.

axis: axis along which we want to calculate the percentile value. Otherwise, it will consider arr to be flattened(works on all the axis). axis = 0 means along the column and axis = 1 means working along the row.

 out :Different array in which we want to place the result. The array must have same dimensions as expected output.

返回：數組的第n個百分位數(如果軸不存在則為標量值)或沿指定軸具有百分位值的數組。

代碼1：工作

# Python Program illustrating  
# numpy.percentile() method  
    
import numpy as np 
    
# 1D array  
arr = [20, 2, 7, 1, 34] 
print("arr:", arr)  
print("50th percentile of arr:",  
       np.percentile(arr, 50)) 
print("25th percentile of arr:", 
       np.percentile(arr, 25)) 
print("75th percentile of arr:", 
       np.percentile(arr, 75))

輸出：

arr: [20, 2, 7, 1, 34]
30th percentile of arr: 7.0
25th percentile of arr: 2.0
75th percentile of arr: 20.0

代碼2：

# Python Program illustrating  
# numpy.percentile() method   
  
import numpy as np 
  
# 2D array  
arr = [[14, 17, 12, 33, 44],   
       [15, 6, 27, 8, 19],  
       [23, 2, 54, 1, 4,]]  
print("\narr:\n", arr)  
     
# Percentile of the flattened array  
print("\n50th Percentile of arr, axis = None:",  
      np.percentile(arr, 50))  
print("0th Percentile of arr, axis = None:",  
      np.percentile(arr, 0))  
     
# Percentile along the axis = 0  
print("\n50th Percentile of arr, axis = 0:",  
      np.percentile(arr, 50, axis =0))  
print("0th Percentile of arr, axis = 0:",  
      np.percentile(arr, 0, axis =0))

輸出：

arr:
 [[14, 17, 12, 33, 44], [15, 6, 27, 8, 19], [23, 2, 54, 1, 4]]

50th Percentile of arr, axis = None: 15.0
0th Percentile of arr, axis = None: 1.0

50th Percentile of arr, axis = 0: [15.  6. 27.  8. 19.]
0th Percentile of arr, axis = 0: [14.  2. 12.  1.  4.]

50th Percentile of arr, axis = 1: [17. 15.  4.]
0th Percentile of arr, axis = 1: [12.  6.  1.]

代碼3：

# Python Program illustrating  
# numpy.percentile() method  
  
import numpy as np 
  
# 2D array  
arr = [[14, 17, 12, 33, 44],   
       [15, 6, 27, 8, 19],  
       [23, 2, 54, 1, 4,]]  
print("\narr:\n", arr)  
  
# Percentile along the axis = 1  
print("\n50th Percentile of arr, axis = 1:",  
      np.percentile(arr, 50, axis =1))  
print("0th Percentile of arr, axis = 1:",  
      np.percentile(arr, 0, axis =1))  
   
print("\n0th Percentile of arr, axis = 1:\n",  
      np.percentile(arr, 50, axis =1, keepdims=True)) 
print("\n0th Percentile of arr, axis = 1:\n",  
      np.percentile(arr, 0, axis =1, keepdims=True))

輸出：

arr:
 [[14, 17, 12, 33, 44], [15, 6, 27, 8, 19], [23, 2, 54, 1, 4]]

0th Percentile of arr, axis = 1:
 [[17.]
 [15.]
 [ 4.]]

0th Percentile of arr, axis = 1:
 [[12.]
 [ 6.]
 [ 1.]]

相關用法

注：本文由純淨天空篩選整理自Mohit Gupta_OMG 大神的英文原創作品 numpy.percentile() in python。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。