Matplotlib Notes

1. import matplotlib.numerix as n a = n.arange(10)   #a = array[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] b = n.take(a, range(2, 5))   #b = array[2, 3, 4]

   xlable(‘time (s)')                #x轴的标题

   ylable(’ volts ‘)                  #y轴的标题

   title(‘A really simple plot’)               #图表的标题

   grid(True)                          #是否有网格

   删除前面画的图像重新画：

   hold(False)

   plot(t,s)

   或者

   clf()    #clear the figure

   cla()   #clear the axes

figure()

axes([0.1,0.1,0.71,0.8]) plot([0,1],[0,1],label="line 1”) hold(1) plot([0,1],[1,0.5],label="line 2”) legend(loc=(1.03,0.2)) show()

axes(rect, axisbg=’w’) where rect=[left, bottom, width, height] in normalized (0,1) units. axisbg

is the background color for the axis, default white. 比如： from pylab import * axes([0.2, 0.5, 0.2, 0.2], axisbg = ‘y’) plot([1,2,3,4], [1,4,9,16], ‘ro’) axis([0, 10, 0, 20]) show()

cursor = Cursor(ax, useblit=True, color='red', linewidth=2 )

动画:

from pylab import * import time ion() x = arange(0,2*pi,0.01)            # x-array line, = plot(x,sin(x)) for i in arange(1,200):     line.set_ydata(sin(x+i/10.0))  # update the data     draw()                         # redraw the canvas show()

sd

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