python如何删除矩阵某一列 python矩阵相除

一维矩阵的加减乘除

import numpy as np

a = np.array([4,2,3])
b = np.array([2,5,7])

c = a+b
d = a-b
e = a*b
f = a/b

print("加%s" % c)
print("减%s" % d)
print("乘%s" % e)
print("除%s" % f)

打印

一维对二维的减价乘除

import numpy as np

a = np.array([4,2,3])
b = np.array([[2,5,7],[1,2,3]])

c = a+b
d = a-b
e = a*b
f = a/b

print("加%s" % c)
print("减%s" % d)
print("乘%s" % e)
print("除%s" % f)

打印

另外

import numpy as np

a = np.array([4,2,3])

c = a+2
d = a-2
e = a*2
f = a/2

print("加%s" % c)
print("减%s" % d)
print("乘%s" % e)
print("除%s" % f)

打印