numpy.concatenate

连接是指加入。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)

这里

序号	参数和描述
1	a1,a2 .. 相同类型的数组序列
2	axis 必须连接数组的轴。默认值为0

例

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)

其输出如下

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]]