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How to convert lists, arrays, and matrices to each other in python

php中世界最好的语言
php中世界最好的语言Original
2018-04-09 17:54:416326browse

This time I will bring you how to convert lists, arrays, and matrices to each other in python, and precautions for converting lists, arrays, and matrices to each other in python. What are they? The following is a practical case. Let’s take a look.

Familiarize yourself with the process through code:

# -*- coding: utf-8 -*-
from numpy import *
a1 =[[1,2,3],[4,5,6]] #列表
print('a1 :',a1)
#('a1 :', [[1, 2, 3], [4, 5, 6]])
a2 = array(a1)  #列表 -----> 数组
print('a2 :',a2)
#('a2 :', array([[1, 2, 3],[4, 5, 6]]))
a3 = mat(a1)   #列表 ----> 矩阵
print('a3 :',a3)
#('a3 :', matrix([[1, 2, 3],[4, 5, 6]]))
a4 = a3.tolist()  #矩阵 ---> 列表
print('a4 :',a4)
#('a4 :', [[1, 2, 3], [4, 5, 6]])
print(a1 == a4)
#True
a5 = a2.tolist()  #数组 ---> 列表
print('a5 :',a5)
#('a5 :', [[1, 2, 3], [4, 5, 6]])
print(a5 == a1)
#True
a6 = mat(a2)  #数组 ---> 矩阵
print('a6 :',a6)
#('a6 :', matrix([[1, 2, 3],[4, 5, 6]]))
print(a6 == a3)
#[[ True True True][ True True True]]
a7 = array(a3) #矩阵 ---> 数组
print('a7 :',a7)
#('a7 :', array([[1, 2, 3],[4, 5, 6]]))
print(a7 == a2)
#[[ True True True][ True True True]]
###################################################################
a1 =[1,2,3,4,5,6] #列表
print('a1 :',a1)
#('a1 :', [1, 2, 3, 4, 5, 6])
a2 = array(a1)  #列表 -----> 数组
print('a2 :',a2)
#('a2 :', array([1, 2, 3, 4, 5, 6]))
a3 = mat(a1)   #列表 ----> 矩阵
print('a3 :',a3)
#('a3 :', matrix([[1, 2, 3, 4, 5, 6]]))
a4 = a3.tolist()  #矩阵 ---> 列表
print('a4 :',a4)
#('a4 :', [[1, 2, 3, 4, 5, 6]])  #注意!!有不同
print(a1 == a4)
#False
a8 = a3.tolist()[0]  #矩阵 ---> 列表
print('a8 :',a8)
#('a8 :', [1, 2, 3, 4, 5, 6]) #注意!!有不同
print(a1 == a8)
#True
a5 = a2.tolist()  #数组 ---> 列表
print('a5 :',a5)
#('a5 :', [1, 2, 3, 4, 5, 6])
print(a5 == a1)
#True
a6 = mat(a2)  #数组 ---> 矩阵
print('a6 :',a6)
#('a6 :', matrix([[1, 2, 3, 4, 5, 6]]))
print(a6 == a3)
#[[ True True True True True True]]
a7 = array(a3) #矩阵 ---> 数组
print('a7 :',a7)
#('a7 :', array([[1, 2, 3, 4, 5, 6]]))
print(a7 == a2)
#[[ True True True True True True]]

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other php Chinese websites related articles!

Recommended reading:

How to assign uniform values ​​to array elements in numpy

How to multiply numpy arrays and matrices use

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