If you try octave from a terminal without it installed it should prompt you to the snap install - be sure to include the # 6.4.0 or whatever is included in the command. I removed the old version of Octave sudo apt remove octave, then installed the new version with snap. Turns out I had installed version 4.4, which was from 2018 (>3 years old). On my own machine, I'm pretty sure I used apt-install to get Octave, but the getframe function I found referenced in other answers wasn't found.For carandraug's answer, writing to a PDF took a very long time and made a gigantic PDF.For Rick T's answer, the code snipped doesn't write a plot figure, it just writes matrix data.I had issues with both answers, and some other issues, too. Had to come chime in here because this was the top Google result for me when I was looking for help with this.
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