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    <p>In general, I'd suggest setting maximum Java Heap Memory to about 25% of the available RAM, which allows you to open lots of figures (but not infinite numbers). If you cannot do this in the preferences (e.g. b/c you have a Mac like mine), <a href="http://www.mathworks.com/support/solutions/en/data/1-18I2C/" rel="nofollow noreferrer">this solution</a> will help - it overrides the preference settings.</p> <p>The linked solution also tells you how much free java memory you have left, and how much total is available: Run the following commands:</p> <pre><code>java.lang.Runtime.getRuntime.maxMemory java.lang.Runtime.getRuntime.totalMemory java.lang.Runtime.getRuntime.freeMemory </code></pre> <p>Unfortunately, a figure doesn't take a fixed amount of Java memory, an empty figure takes much less than one displaying 10k points, and a minimized figure takes less memory than a maximized one. However, if you can estimate the average memory needed per figure, you can indeed write a wrapper for <code>figure</code> that checks whether it's likely that this figure will be the last. Alternatively/additionally, you could make the wrapper function minimize all other figures (<a href="http://undocumentedmatlab.com/blog/minimize-maximize-figure-window/" rel="nofollow noreferrer">see Undocumented Matlab</a> for this).</p> <p><strong>EDIT</strong> As pointed out by <a href="https://stackoverflow.com/questions/6201272/how-to-avoid-matlab-crash-when-opening-too-many-figures/6201399#6201399">@Peter Lawrey</a>, you may also try and perform garbage collection before checking how much memory is available - though I don't know whether Matlab would try that, anyway.</p>
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    1. COfreeMemory only tells you how much is free now, not how much would be free if you performed a GC.
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