Python 画图学习入门

Python:使用matplotlib绘制图表


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/

数学库numpy下载及API手册地址: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:

1.#!/usr/bin/env python
2.import matplotlib.pyplot as plt
3.
4.plt.plot([10, 20, 30])
5.plt.xlabel('tiems')
6.plt.ylabel('numbers')
7.plt.show()


2.饼图:

代码:

1.#!/usr/bin/env python
2.# -*- coding: utf-8 -*-
3.
4.from pylab import *
5.
6.# make a square figure and axes
7.figure(1, figsize=(6,6))
8.ax = axes([0.1, 0.1, 0.8, 0.8])
9.
10.labels = 'Frogs', 'Hogs', 'Dogs', 'Logs'
11.fracs = [15,30,45, 10]
12.
13.explode=(0, 0.05, 0, 0)
14.pie(fracs, explode=explode, labels=labels, autopct='%1.1f%%', shadow=True)
15.title('Raining Hogs and Dogs', bbox={'facecolor':'0.8', 'pad':5})
16.savefig('D:\\pie.png')
17.show()


3、使用numpy库函数:

代码:

1.#!/usr/bin/env python
2.# -*- coding: utf-8 -*-
3.
4.import numpy as np
5.import matplotlib.pyplot as plt
6.
7.t = np.arange(0.0, 1.01, 0.01)
8.s = np.sin(2*2*np.pi*t)
9.
10.plt.fill(t, s*np.exp(-5*t), 'r')
11.plt.grid(True)
12.
13.#保存为PDF格式,也可保存为PNG等图形格式
14.plt.savefig('D:\\test.pdf')
15.plt.show()


参考网址:http://www.linuxidc.com/Linux/2012-02/55296.htm


演示如何实现Matplotlib绘图并保存图像但不显示图形的方法
http://blog.csdn.net/rumswell/article/details/7342479

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转载自blog.csdn.net/tzqmiaomiao/article/details/84254817