This article brings you an introduction to the usage of the matplotlib library in Python. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
Introduction
The matplotlib library is a 2D drawing library in Python.
Installation
$ pip install matplotlib
Getting started
Drawing a line chart
pyplot function to draw a line chart
Here is a line chart of months and temperature :
import matplotlib.pyplot as plt x_month = [3,4,5,6,7,8,9] y_temperature = [18,24,27,30,35,37,31] plt.plot(x_month,y_temperature) plt.show() # plt.savefig('xxx.png') # 保存图标函数
Import the pyplot module here and name it plt. show()
is used to display pictures. savefig()
is used to save pictures.
Set x,y axis
import matplotlib.pyplot as plt x_month = [1,2,3,4,5,6,7,8] y_temperature = [11,22,23,43,20,23,42,42] plt.plot(x_month,y_temperature,linewidth=5) # linewidth定义折线宽度 plt.title("This is Title") # 标题 plt.xlabel("month",fontsize=14) # x轴 plt.ylabel("temperature",fontsize=14) # y轴 plt.tick_params(axis='both',labelsize=14) # 影响xy刻度的函数 plt.show() # 展示 # plt.savefig('xxx.png') # 保存图标函数
fontsize
is used to set the font size of each axis.
Draw a single point graph
scatter function draws a single point graph
import matplotlib.pyplot as plt plt.scatter(1,8,s=50,c='red') plt.show()
Parameterss
sets the size of the points used when drawing graphics. c
The color of the parameter setting point can also be specified through RDB: c=(0,0,0.8)
Draw a series of points
import matplotlib.pyplot as plt x_values = list(range(1001)) y_values = [x**2 for x in x_values] plt.scatter(x_values,y_values,s=40,edgecolors='none') # edgecolors参数用于去除外轮廓 plt.show()
edgecolors
can specify white
or black
, etc.
Draw the color map
import matplotlib.pyplot as plt x_values = list(range(1001)) y_values = [x**2 for x in x_values] plt.scatter(x_values,y_values,s=40,edgecolors='none',c=y_values,cmap=plt.cm.Blues)
Pass the y_values parameter into c
, and use cmap
to tell the function which color to use for mapping.
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