如何从Matplotlib图中提取数据 [英] How to extract data from matplotlib plot

问题描述

我有一个wxPython程序，该程序从不同的数据集中读取数据，对数据执行各种简单的即时分析，并将数据集的各种组合绘制到matplotlib画布上.我希望有机会将当前绘制的数据转储到文件中，以便稍后进行更复杂的分析.

I have a wxPython program which reads from different datasets, performs various types of simple on-the-fly analysis on the data and plots various combinations of the datasets to matplotlib canvas. I would like to have the opportunity to dump currently plotted data to file for more sophisticated analysis later on.

问题是:matplotlib中是否有任何方法可以访问matplotlib.Figure中当前绘制的数据?

The question is: are there any methods in matplotlib that allow access to the data currently plotted in matplotlib.Figure?

推荐答案

Jakub正确地修改了Python脚本，以便直接从发送数据的源中写入数据；这就是我更愿意这样做的方式.但作为参考，如果您确实需要从绘图中获取数据，我认为应该这样做

Jakub is right about modifying the Python script to write out the data directly from the source from which it was sent into the plot; that's the way I'd prefer to do this. But for reference, if you do need to get data out of a plot, I think this should do it

gca().get_lines()[n].get_xydata()

或者，您可以分别获取x和y数据集:

Alternatively you can get the x and y data sets separately:

line = gca().get_lines()[n]
xd = line.get_xdata()
yd = line.get_ydata()

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