今天看了一下使用python繪製圖表的方法,有個強大的類庫matplotlib,可以製作出高品質的2D和3D圖形,先記錄一下,以後慢慢學習。
matplotlib下載及API手冊地址:http://sourceforge.net/projects/matplotlib/files/matplotlib/
數學庫numpy下載及API手冊地址:http://www.scipy.org/Download
幾個繪圖的例子,來自API手冊:
1、最簡單的圖:
代碼:
#!/usr/bin/env pythonimport matplotlib.pyplot as pltplt.plot([10, 20, 30])plt.xlabel('tiems')plt.ylabel('numbers')plt.show()
測試:
2.餅圖:
代碼:
#!/usr/bin/env python# -*- coding: utf-8 -*-from pylab import *# make a square figure and axesfigure(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()
測試:
3、使用numpy庫函數:
代碼:
#!/usr/bin/env python# -*- coding: utf-8 -*-import numpy as npimport matplotlib.pyplot as pltt = 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)#儲存為PDF格式,也可儲存為PNG等圖形格式plt.savefig('D:\\test.pdf')plt.show()
測試: