Where can I find demo codes for a package?

Dear All Octave Developers and Users,
I am looking for demo codes for Octave v5.2. Particularly, I am interested in NaN Package demo codes.

So please figure our where I can find their demo codes.
Thanks for your attentions. :upside_down_face:

My system:
Windows 10 amd64, Octave v5.2

If it is an Octave Forge package (the nan-package is one) you can find a link to the function reference, the project homepage, and sometimes an additional “package documentation” (not for the nan-package) there.

Furthermore, in the Octave wiki there exists sometimes a documentation too.

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I also find this method:

demo command_name

If there is a demo, the above command will show the codes and run it.