python operates two-dimensional array drawing

This time I will bring you python operationTwo-dimensional arrayDrawing, what are the precautions for Python operation of two-dimensional array drawing, the following is a practical case, let's take a look.

1. Two-dimensional array value

Note: Whether it is a two-dimensional array or one-dimensional array, The data types in the array must be exactly the same, that is, if they are numeric types, they must all be numeric types

#二维数组
import numpy as np
list1=[[1.73,1.68,1.71,1.89,1.78],
   [54.4,59.2,63.6,88.4,68.7]]
list3=[1.73,1.68,1.71,1.89,1.78]
list4=[54.4,59.2,63.6,88.4,68.7]
list5=np.array([1.73,1.68,1.71,1.89,1.78])
list6=np.array([54.4,59.2,63.6,88.4,68.7])
#构造二维数组
list=np.array([[1.73,1.68,1.71,1.89,1.78],
   [54.4,59.2,63.6,88.4,68.7]])
print type(list1)
#两个list直接相运算是会报错的，如果想得到list3中的每个数据除以list4中相对应的数据值，则要引入nump中的array函数
# print list3/list4
#下面的可以实现list5/list6
print list5/list6
print type(list) #结果：<type &#39;numpy.ndarray&#39;>
print list.shape #结果：(2, 5) 二行5列二维数组
print list[0][2] #结果：1.71 ,取第0行第二列数值，即第三列1.71
print list[0,2]  #结果：1.71 ,取第0行第二列数值，即第三列1.71
print list[:,1:3] #结果：[[ 1.68  1.71] [ 59.2  63.6 ]]，取所有行的，第一列和第三列数据
print list[1,:]  #结果：[ 54.4 59.2 63.6 88.4 68.7]，取第一行的所有数值

#2. Drawing

(1) Line chart

import matplotlib.pyplot as plt
year=[1950,1970,1990,2010]
pop=[2.518,3.68,5.23,6.97]
# 1.线图
#调用plt。plot来画图,横轴纵轴两个参数即可
plt.plot(year,pop)
# python要用show展现出来图
plt.show()

(2) Scatter chart

import matplotlib.pyplot as plt
year=[1950,1970,1990,2010]
pop=[2.518,3.68,5.23,6.97]
#2.散点图,只是用用scat函数来调用即可
plt.scatter(year,pop)
plt.show()

(3) Histogram

import matplotlib.pyplot as plt
#3.直方图
# 用hist(x,bins=10)函数来画，参数中x是个List,构建直方图的数集，bins是算出数据的边界及每个bin中有多少个数据点
values=[0,0.6,1.4,1.6,2.2,2.5,2.6,3.2,3.5,3.9,4.2,6]
#有12个数据，bins=3将其分为3段，即(0,2),(2,4),(4,6),从直方图中可以看出(2,4)中的数据最多
plt.hist(values,bins=3)
plt.show()

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

Recommended reading:

Detailed explanation of the steps of Python variable assignment

Detailed explanation of python configuration and use of OpenCV

The above is the detailed content of python operates two-dimensional array drawing. For more information, please follow other related articles on the PHP Chinese website!