Missing Some Functions

I think this is a simple question but I didn’t find an answer after searching for a bit. How do I know what packages I need to load for certain functions? For instance, to use csv2cell I know I need to load the io package. However, I am trying to use xticklabels but I get error: 'xticklabels' undefined which I think means I need to load a package but I am not sure which one. I’m using Octave 4.2.2.

Octave 4.2.2 is very old and the xticklabels function happens to be present by default on recent versions of Octave. You could either update Octave to the current 6.4, or just copy the function file in your path

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