Make nargin and nargout behave more like Matlab's (Bug #32700) * ov-usr-fcn.cc: Include "ov-fcn-handle.h". (Fnargout, Fnargin) nargout can be given a function handle as well as a string. Allow nargout(fcn) works in the top level. Make inline functions always return 1. Make anonymous functions always return -1. Make functions with varargout optionally preceded by named outputs return -(length_output_list_including_the_varargout).

#include <octave/oct.h>

DEFUN_DLD (addtwomatrices, args, , "Add A to B")
{
  int nargin = args.length ();
  if (nargin != 2)
    print_usage ();
  else
    {
      NDArray A = args(0).array_value ();
      NDArray B = args(1).array_value ();
      if (! error_state)
        return octave_value (A + B);
    }
  return octave_value_list ();
}