Python:使用matplotlib绘制图表

最后更新于:2022-04-01 19:39:55

今天看了一下使用python绘制图表的方法,有个强大的类库matplotlib,可以制作出高质量的2D和3D图形,先记录一下,以后慢慢学习。 matplotlib下载及API手册地址:[http://sourceforge.net/projects/matplotlib/files/matplotlib/](http://sourceforge.net/projects/matplotlib/files/matplotlib/) 数学库numpy下载及API手册地址:[http://www.scipy.org/Download](http://www.scipy.org/Download) 几个绘图的例子,来自API手册: 1、最简单的图: 代码: ~~~ #!/usr/bin/env python import matplotlib.pyplot as plt plt.plot([10, 20, 30]) plt.xlabel('tiems') plt.ylabel('numbers') plt.show() ~~~ 测试: ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-06-08_57579356028ce.gif) 2.饼图: 代码: ~~~ #!/usr/bin/env python # -*- coding: utf-8 -*- from pylab import * # make a square figure and axes figure(1, figsize=(6,6)) ax = axes([0.1, 0.1, 0.8, 0.8]) labels = 'Frogs', 'Hogs', 'Dogs', 'Logs' fracs = [15,30,45, 10] explode=(0, 0.05, 0, 0) pie(fracs, explode=explode, labels=labels, autopct='%1.1f%%', shadow=True) title('Raining Hogs and Dogs', bbox={'facecolor':'0.8', 'pad':5}) savefig('D:\\pie.png') show() ~~~ 测试: ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-06-08_575793561a6e5.gif) 3、使用numpy库函数: 代码: ~~~ #!/usr/bin/env python # -*- coding: utf-8 -*- import numpy as np import matplotlib.pyplot as plt t = np.arange(0.0, 1.01, 0.01) s = np.sin(2*2*np.pi*t) plt.fill(t, s*np.exp(-5*t), 'r') plt.grid(True) #保存为PDF格式,也可保存为PNG等图形格式 plt.savefig('D:\\test.pdf') plt.show() ~~~ 测试: ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-06-08_57579356335e9.gif)
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