NumPy numpy.concatenate 函数

• 

  简述

  串联是指加入。此函数用于沿指定轴连接两个或多个相同形状的数组。该函数采用以下参数。

  
  numpy.concatenate((a1, a2, ...), axis)
  

  函数说明

  序号	参数及说明
  1	a1,a2.. 相同类型的数组序列
  2	axis 必须沿其连接阵列的轴。默认为 0

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  例子

  
  import numpy as np 
  a = np.array([[1,2],[3,4]]) 
  print 'First array:' 
  print a 
  print '\n'  
  b = np.array([[5,6],[7,8]]) 
  print 'Second array:' 
  print b 
  print '\n'  
  # both the arrays are of same dimensions 
  print 'Joining the two arrays along axis 0:' 
  print np.concatenate((a,b)) 
  print '\n'  
  print 'Joining the two arrays along axis 1:' 
  print np.concatenate((a,b),axis = 1)
  

  它的输出如下 -

  
  First array:
  [[1 2]
   [3 4]]
  Second array:
  [[5 6]
   [7 8]]
  Joining the two arrays along axis 0:
  [[1 2]
   [3 4]
   [5 6]
   [7 8]]
  Joining the two arrays along axis 1:
  [[1 2 5 6]
   [3 4 7 8]]