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Python numpy.asfortranarray()用法及代碼示例


當我們要將輸入轉換為以Fortran順序排列在內存中的數組時,將使用numpy.asfortranarray()函數。輸入包括標量,列表,元組列表,元組,元組元組,列表元組和ndarray。

用法: numpy.asfortranarray(arr, dtype=None)

參數:
arr :[數組]輸入數據,可以轉換為浮點型數組的任何形式。這包括標量,列表,元組列表,元組,元組元組,列表元組和ndarray。
dtype :默認情況下,從輸入數據中推斷出數據類型。


Return :以Fortran或專欄為主的順序輸入arr。

代碼#1:列出到fortranarray

# Python program explaining 
# numpy.asfortranarray() function 
  
import numpy as geek 
my_list = [1, 3, 5, 7, 9] 
  
print ("Input  list:", my_list) 
   
    
out_arr = geek.asfortranarray(my_list) 
print ("output fortanarray from input list:", out_arr) 

輸出:

Input  list: [1, 3, 5, 7, 9]
output fortanarray from input list: [1 3 5 7 9]


代碼2:元組到fortanarray

# Python program explaining 
# numpy.asfortranarray() function 
  
import numpy as geek 
  
my_tuple = ([1, 3, 9], [8, 2, 6]) 
   
print ("Input  tuple:", my_tuple) 
    
out_arr = geek.asfortranarray(my_tuple, dtype ='int8')  
print ("output fortan array from input tuple:", out_arr) 

輸出:

Input  tuple: ([1, 3, 9], [8, 2, 6])
output fortan array from input touple: [[1 3 9]
 [8 2 6]]


代碼#3:標量到fortanarray

# Python program explaining 
# numpy.asfortranarray() function 
  
import numpy as geek 
  
my_scalar = 15
   
print ("Input  scalar:", my_scalar) 
    
out_arr = geek.asfortranarray(my_scalar, dtype ='float')  
print ("output fortan array from input scalar:", out_arr) 

輸出:

Input  scalar: 15
output fortan array from input scalar: [ 15.]


代碼#4:從數組到fortanarray

# Python program explaining 
# numpy.asfortranarray() function 
  
import numpy as geek 
  
in_arr = geek.arange(9).reshape(3, 3) 
   
print ("Input  array:", in_arr) 
  
# checking if it is fortanarray 
print(in_arr.flags['F_CONTIGUOUS']) 
  
out_arr = geek.asfortranarray(in_arr, dtype ='float')  
print ("output array from input array:", out_arr)  
  
# checking if it has become fortanarray 
print(out_arr.flags['F_CONTIGUOUS'])

輸出:

Input  array: [[0 1 2]
 [3 4 5]
 [6 7 8]]
False
output array from input array: [[ 0.  1.  2.]
 [ 3.  4.  5.]
 [ 6.  7.  8.]]
True


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注:本文由純淨天空篩選整理自jana_sayantan大神的英文原創作品 numpy.asfortranarray() 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。