NumPy numpy.delete 函数

• 

  简述

  此函数返回一个新数组，其中指定的子数组从输入数组中删除。与 insert() 函数的情况一样，如果不使用轴参数，则将输入数组展平。该函数采用以下参数 -

  
  Numpy.delete(arr, obj, axis)
  

  函数说明

  序号	参数及说明
  1	arr 输入数组
  2	obj 可以是切片、整数或整数数组，表示要从输入数组中删除的子数组
  3	axis 删除给定子数组的轴。如果没有给出， arr 被展平

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  例子

  
  import numpy as np 
  a = np.arange(12).reshape(3,4) 
  print 'First array:' 
  print a 
  print '\n'  
  print 'Array flattened before delete operation as axis not used:' 
  print np.delete(a,5) 
  print '\n'  
  print 'Column 2 deleted:'  
  print np.delete(a,1,axis = 1) 
  print '\n'  
  print 'A slice containing alternate values from array deleted:' 
  a = np.array([1,2,3,4,5,6,7,8,9,10]) 
  print np.delete(a, np.s_[::2])
  

  它的输出如下 -

  
  First array:
  [[ 0 1 2 3]
   [ 4 5 6 7]
   [ 8 9 10 11]]
  Array flattened before delete operation as axis not used:
  [ 0 1 2 3 4 6 7 8 9 10 11]
  Column 2 deleted:
  [[ 0 2 3]
   [ 4 6 7]
   [ 8 10 11]]
  A slice containing alternate values from array deleted:
  [ 2 4 6 8 10]