当我们按照前一篇博文
/tao_627/article/details/44004541
配置好python的绘图环境后,下面给出几个有代表性的例子:
一.绘制柱状图
#!/usr/bin/env_python#encoding: utf-8import matplotlib.pyplot as pltdef bar_chart_generator():l=[1,2,3,4,5]h=[20,14,38,27,9]w=[0.1,0.2,0.3,0.4,0.5]b=[1,2,3,4,5]fig=plt.figure()ax=fig.add_subplot(111)rects=ax.bar(l,h,w,b)plt.show()bar_chart_generator()
二.绘制曲线图
#!/usr/bin/env_python#encoding: utf-8#usage: python curve_demo.pyimport matplotlib.pyplot as pltimport numpy as np#To draw y=x^2(-3<=x<=3)x = np.arange(-3,3.5,0.5)y = [ele**2 for ele in x]z = [ele *2 for ele in x]fig = plt.figure(1)ax = fig.add_subplot(211)line1 = ax.plot(x,y,'ro-')ax = fig.add_subplot(212)line2 = ax.plot(x,z,'g-')plt.show()
三.绘制折线图
#!/usr/bin/env_python#encoding: utf-8import numpy as npimport pylab as plfrom StringIO import StringIOdata_str = """-04-01_02 68-04-01_05 70-04-01_08 69-04-01_11 71-04-01_14 72-04-01_20 70-04-02_02 71-04-02_05 70-04-02_08 69-04-02_11 71-04-02_14 69-04-02_20 71-04-03_02 74-04-03_05 73-04-03_08 77-04-03_11 70-04-03_14 71-04-03_20 70-04-04_02 70-04-04_05 72-04-04_08 72-04-04_11 69-04-04_14 71-04-04_20 69-04-05_02 75"""data = np.loadtxt(StringIO(data_str), dtype=np.dtype([("t", "S13"),("v", float)]))datestr = np.char.replace(data["t"], "_", " ")t = pl.datestr2num(datestr)v = data["v"]pl.plot_date(t, v, fmt="-o")pl.subplots_adjust(bottom=0.3)ax = pl.gca()ax.fmt_xdata = pl.DateFormatter('%Y-%m-%d %H:%M:%S')pl.xticks(rotation=90)pl.xticks(t, datestr) # 如果以数据点为刻度，则注释掉这一行ax.xaxis.set_major_formatter(pl.DateFormatter('%Y-%m-%d %H'))pl.grid()pl.show()
参考文献
[1]./s/blog_68b606350101ryao.html
