Python--绘图工具matplotlib的使用

1、下载并安装适合自己Python的numpy安装包

numpy : http://sourceforge.net/projects/numpy/files/NumPy/1.7.1/

2、下载并安装matplotlib

matplotlib : http://www.lfd.uci.edu/~gohlke/pythonlibs/#matplotlib

3、点击按钮实现画一个正弦波

from Tkinter import *import matplotlib.pyplot as pltimport numpy as npdef draw_sin():#draw a circle of sint = np.arange(1,256,1)y = np.sin(2*np.pi*t/256)plt.plot(t,y,'g')plt.show()root = Tk(className = 'DrawSin')label = Label(root)label['text'] = 'Draw Sin'label.pack()button = Button(root)button['text'] = 'Draw'button['command'] = draw_sinbutton.pack()root.mainloop()

效果

显示主菜单

点击按钮实现画图

4、点击按钮实现波形的变化

#!usr/bin/env/python#coding=utf-8from Tkinter import *import matplotlib.pyplot as pltimport numpy as npimport sys#number of pointNumber = 1024#init frequency valuefrequency = 1#set the recur depthsys.setrecursionlimit(1000000)def draw_sin():'''raw a circle of sin'''#generate the time baset = np.arange(1,Number,1)#generate the signaly = np.sin(2*np.pi*frequency*t/Number)plt.plot(t,y)plt.grid(True)plt.text(900,0.75,'Frequency is '+str(frequency))plt.show()def frequency_plus():'''function of add the frequency and plot the signal'''#notice:frequency is a global variableglobal frequency frequency = frequency + 1#clear a figure windowplt.clf()draw_sin()def my_button(root,label_text,button_text,button_func):'''function of creat label and button'''#label detailslabel = Label(root)label['text'] = label_textlabel.pack()#label detailsbutton = Button(root)button['text'] = button_textbutton['command'] = button_funcbutton.pack()def main():'''main function'''root = Tk(className = 'DrawSin')#draw button functionmy_button(root,'Draw sin','click to Draw',draw_sin)#frequency plus functionmy_button(root,'Freq Plus','click to Plus',frequency_plus)root.mainloop()if __name__ == "__main__":main()

效果

显示主菜单

点击按钮实现频率改变

5、可能出现的问题

RuntimeError: maximum recursion depth exceeded

解决方法：

http://blog.csdn.net/lmh12506/article/details/7865288

网上学习资料：

matplotlib手册

http://wenku.baidu.com/view/dcee911cfad6195f312ba61c.html

python使用matplotlib绘图

http://www.cnblogs.com/qianlifeng/archive/2012/02/13/2350086.html