[Python知识库]numpy入门-----广播机制

广播机制

import numpy as np
data1 = np.array([1,2,3])
data2 = np.array([1,2])

print(data1,data2)

[1 2 3] [1 2]

加减乘除

         1                              1   +  1              2
data1:[  2 ] +(-,*,/) data2:[ 1] =  [   2   +  1   ]  =  [    3   ]
         3                              3   +  1              4

import numpy as np
data1 = np.array([1,2,3])
data2 = np.array([1])
a = data1 + data2
b = data1 - data2
c = data1 * data2
d = data1 / data2
print(a,b,c,d)

[2 3 4] [0 1 2] [1 2 3] [1. 2. 3.]