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    <p>They all do different things, since matplotlib uses a hierarchical order in which a figure window contains a figure which may consist of many axes. Additionally, there are functions from the pyplot interface and there are methods on the <code>Figure</code> class. I will discuss both cases below.</p> <h2>pyplot interface</h2> <p><code>pyplot</code> is a module that collects a couple of functions that allow matplotlib to be used in a functional manner. I here assume that <code>pyplot</code> has been imported as <code>import matplotlib.pyplot as plt</code>. In this case, there are three different commands that remove stuff:</p> <p><a href="http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.cla" rel="noreferrer"><code>plt.cla()</code> clears an axes</a>, i.e. the currently active axes in the current figure. It leaves the other axes untouched.</p> <p><a href="http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.clf" rel="noreferrer"><code>plt.clf()</code> clears the entire current figure</a> with all its axes, but leaves the window opened, such that it may be reused for other plots.</p> <p><a href="http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.close" rel="noreferrer"><code>plt.close()</code> closes a window</a>, which will be the current window, if not specified otherwise.</p> <p>Which functions suits you best depends thus on your use-case.</p> <p>The <code>close()</code> function furthermore allows one to specify which window should be closed. The argument can either be a number or name given to a window when it was created using <code>figure(number_or_name)</code> or it can be a figure instance <code>fig</code> obtained, i.e., using<code>fig = figure()</code>. If no argument is given to <code>close()</code>, the currently active window will be closed. Furthermore, there is the syntax <code>close('all')</code>, which closes all figures.</p> <h2>methods of the Figure class</h2> <p>Additionally, the <code>Figure</code> class provides methods for clearing figures. I'll assume in the following that <code>fig</code> is an instance of a <code>Figure</code>:</p> <p><a href="http://matplotlib.org/api/figure_api.html#matplotlib.figure.Figure.clf" rel="noreferrer"><code>fig.clf()</code> clears the entire figure</a>. This call is equivalent to <code>plt.clf()</code> only if <code>fig</code> is the current figure.</p> <p><code>fig.clear()</code> is a synonym for <code>fig.clf()</code></p> <p>Note that even <code>del fig</code> will not close the associated figure window. As far as I know the only way to close a figure window is using <code>plt.close(fig)</code> as described above.</p>
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    1. POWhen to use cla(), clf() or close() for clearing a plot in matplotlib?
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    1. USDavid Zwicker
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    1. POWhen to use cla(), clf() or close() for clearing a plot in matplotlib?
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    1. COThanks David for the clear explanation. A couple of extra sentences in the matplotlib documentation would go a long way!
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    2. COBecause `close()` is a non-specific command, I went looking for a way to specify figure closure (`fig.close()` is not a function). The correct syntax is: `plt.close(fig)`.
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    3. COGood point. I added more details to the answer.
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      1. USDavid Zwicker
 

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