In order to launch MATLAB R2013a or prior on your Mac, Java 6 will need to be installed on your computer and used by MATLAB. If Java SE 8 is also installed on the same computer, it can prohibit MATLAB from using Java 6 on startup. To change the Java MATLAB uses when launching, refer to the following article:
I think export_fig grabs pixels from the display memory, though I could be wrong. I never would have tried to run it with the nodisplay option so that nothing is displayed. Is anything at all being saved, like whatever happens to be on your screen at the moment?
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