savefig 循环将先前的图添加到图 [英] savefig loop adds previous plots to figure

问题描述

我正在尝试使用 forloop 为我拥有的每组数据生成数字，但是虽然 .show() 命令生成正确的数字，但 .savefig() 不断将先前绘制的值添加到新数字中.在我的 forloop 中，这是代码的相关示例.

I am trying to use a forloop to produce figures for each set of data I have, but while the .show() command produces the correct figure, .savefig() keeps adding the previous plotted values to the new figure. In my forloop, this is the relevant sample of the code.

import matplotlib.pyplot as plt
plt.plot(X,Y[:,0],'o-')
plt.xlabel('x')
plt.savefig('plot'+str(i)+'.png')

作为比较，这里是 savefig plot，这里是 show().可以看出，savefig() 图也绘制了之前的结果.

As a comparison, here is the savefig plot and here is that shown by show(). As can be seen, the savefig() plot also plotted the previous result.

推荐答案

用函数保存后必须关闭当前图形plt.close():http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.close

You have to close current figure after saving with function plt.close(): http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.close

或者你必须在通过 plt.clf() 保存后清理当前图形:http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.clf

Or you have to clean current figure after saving by plt.clf(): http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.clf

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