Python 基础教程

Python 练习实例44 - Python 两个矩阵相加

两个 3 行 3 列的矩阵，实现其对应位置的数据相加，并返回一个新矩阵：

X = [[12,7,3],
    [4 ,5,6],
    [7 ,8,9]]

Y = [[5,8,1],
    [6,7,3],
    [4,5,9]]

程序分析：创建一个新的 3 行 3 列的矩阵，使用 for 迭代并取出 X 和 Y 矩阵中对应位置的值，相加后放到新矩阵的对应位置中。

程序源代码:

源代码:

#!/usr/bin/python # -*- coding: UTF-8 -*- X = [[12,7,3], [4 ,5,6], [7 ,8,9]] Y = [[5,8,1], [6,7,3], [4,5,9]] result = [[0,0,0], [0,0,0], [0,0,0]] # 迭代输出行 for i in range(len(X)): # 迭代输出列 for j in range(len(X[0])): result[i][j] = X[i][j] + Y[i][j] for r in result: print(r)

执行以上代码，输出结果如下：

[17, 15, 4]
[10, 12, 9]
[11, 13, 18]

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Python 练习实例43

Python 练习实例45

9 篇笔记写笔记

参考方法：

#!/usr/bin/python
# -*- coding: UTF-8 -*-

x = [[12,7,3],
        [4,5,6],
        [7,8,9]]

y = [[5,8,1],
        [6,7,3],
        [4,5,9]]
z= []
for i in range(3):
    z.append([])
for i in range(3):
    for j in range(3):
        z[i].append(x[i][j]+y[i][j])
print z

super3年前 (2017-04-01)

参考方法：

#!/usr/bin/python
# -*- coding: UTF-8 -*-

x=[[12,7,3],
    [4 ,5,6],
    [7 ,8,9]]
y=[[5,8,1],
    [6,7,3],
    [4,5,9]]

c=[]
d=[]

for index,element in enumerate(x):
    for  i in range(len(element)):
        m=x[index][i]+y[index][i]
        c.append(m)

        if len(c)==3:
            d.append(c)
            c=[]
print d

lll3年前 (2017-04-20)

参考方法：

# coding:utf-8
import numpy as np

X = [[12,7,3],
    [4 ,5,6],
    [7 ,8,9]]

Y = [[5,8,1],
    [6,7,3],
    [4,5,9]]

Z=np.zeros(shape=(len(X),len(X[0])))

for i in range(0,len(X)):
    for j in range(0,len(X[0])):
        Z[i][j]=X[i][j]+Y[i][j]


print(Z)

朦胧3年前 (2017-06-13)

参考方法：

#!/usr/bin/python
# -*- coding: UTF-8 -*-

X = [[12,7,3],
    [4 ,5,6],
    [7 ,8,9]]

Y = [[5,8,1],
    [6,7,3],
    [4,5,9]]
m = [[],
    [],
    []]

for (i,j,k) in zip(X,Y,range(3)):
    for (a,b)in zip(i,j):
        m[k].append(a+b)
for r in m:
    print r

qingfeng3年前 (2017-06-13)

使用 numpy:

#!/usr/bin/python
# coding:utf-8

import numpy as np

x = np.array( [[12,7,3],
               [4 ,5,6],
               [7 ,8,9]])
y = np.array( [[5,8,1],
               [6,7,3],
               [4,5,9]])

z = x+y
print z

du_solong3年前 (2017-06-14)

Python3 使用 random 随机生成两个矩阵：

import random

data1 = [[random.randint(1,100) for i in range(3)] for j in range(3)]
data2 = [[random.randint(1,100) for i in range(3)] for j in range(3)]

print("data1:",data1)
print("data2:",data2)

data3 = data1[:]

for i in range(len(data1)):
    for j in range(len(data1[i])):
        data3[i][j] = data1[i][j] + data2[i][j]
print("data3:",data3)

hello world3年前 (2017-06-25)

参考方法：

# -*- coding: utf-8 -*-

def matrix():
    X = [[12,7,3],
         [4 ,5,6],
         [7 ,8,9]]

    Y = [[5,8,1],
         [6,7,3],
         [4,5,9]]

    a_list=[]
    a_list_1=[]
    a_list_2=[]
    a_list_3=[]
    for i in range(3):
        for j in range(3):
            if i==0:
                temp=a_list_1
            elif i==1:
                temp=a_list_2
            else:
                temp=a_list_3
            temp.append(X[i][j]+Y[i][j])
    a_list.insert(0,a_list_1)
    a_list.insert(1,a_list_2)
    a_list.insert(2,a_list_3)
    print(a_list)

matrix()

ray3年前 (2017-08-11)

参考方法：

#!/usr/bin/python
# -*- coding: UTF-8 -*-

import numpy as np
a=np.random.randint(0,100,9).reshape(3,3)
b=np.random.randint(0,100,9).reshape(3,3)

print(a+b)

sun_shine3年前 (2017-08-13)

使用匿名函数：

#!/usr/bin/python
# -*- coding: UTF-8 -*-

X = [[12,7,3],
    [4,5,6],
    [7,8,9]]

Y = [[5,8,1],
    [6,7,3],
    [4,5,9]]

Z = []
for i in range(3):
    zz = map(lambda a,b:a+b, X[i],Y[i])
    Z.append(zz)
print Z

奚适2年前 (2017-12-21)