Python 向现有图形添加新图
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add new plot to existing figure
提问by Jan-Bert
I have a script with some plots ( see example code). After some other things i want to add a new plot to an existing one. But when i try that it add the plot by the last created figure(now fig2). I can't figure out how to change that...
我有一个带有一些情节的脚本（参见示例代码）。在其他一些事情之后，我想为现有的情节添加一个新的情节。但是当我尝试通过最后创建的图形（现在是 fig2）添加绘图时。我不知道如何改变它......
import matplotlib.pylab as plt
import numpy as np
n = 10
x1 = np.arange(n)
y1 = np.arange(n)
fig1 = plt.figure()
ax1 = fig1.add_subplot(111)
ax1.plot(x1,y1)
fig1.show()
x2 = np.arange(10)
y2 = n/x2
# add new data and create new figure
fig2 = plt.figure()
ax2 = fig2.add_subplot(111)
ax2.plot(x2,y2)
fig2.show()
# do something with data to compare with new data
y1_geq = y1 >= y2
y1_a = y1**2
ax1.plot(y1_geq.nonzero()[0],y1[y1_geq],'ro')
fig1.canvas.draw
回答by albert
Since your code is not runnable without errors I'll provide a sample snippet showing how to plot several data in same graph/diagram:
由于您的代码无法在没有错误的情况下运行，我将提供一个示例片段，展示如何在同一图形/图表中绘制多个数据：
import matplotlib.pyplot as plt
xvals = [i for i in range(0, 10)]
yvals1 = [i**2 for i in range(0, 10)]
yvals2 = [i**3 for i in range(0, 10)]
f, ax = plt.subplots(1)
ax.plot(xvals, yvals1)
ax.plot(xvals, yvals2)
So the basic idea is to call ax.plot()for all datasets you need to plot into the same plot.
因此，基本思想是将ax.plot()您需要绘制的所有数据集调用到同一个图中。
