NumPy 中的 delete函数

此函数返回一个新数组，其中指定的子数组已从数组中删除，与insert()函数一样，如果不使用axis参数，则将输入数组展平，该函数采用以下参数-

Numpy.delete(arr, obj, axis)

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])

其输出如下-

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]