(octave.info)Subfunctions

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11.9.2 Subfunctions
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A function file may contain secondary functions called “subfunctions”.
These secondary functions are only visible to the other functions in the
same function file.  For example, a file ‘f.m’ containing

     function f ()
       printf ("in f, calling g\n");
       g ()
     endfunction
     function g ()
       printf ("in g, calling h\n");
       h ()
     endfunction
     function h ()
       printf ("in h\n")
     endfunction

defines a main function ‘f’ and two subfunctions.  The subfunctions ‘g’
and ‘h’ may only be called from the main function ‘f’ or from the other
subfunctions, but not from outside the file ‘f.m’.

 -- : localfunctions ()
     Return a list of all local functions, i.e., subfunctions, within
     the current file.

     The return value is a column cell array of function handles to all
     local functions accessible from the function from which
     ‘localfunctions’ is called.  Nested functions are _not_ included in
     the list.

     If the call is from the command line, an anonymous function, or a
     script, the return value is an empty cell array.

     See also: Note: functions.