Re: named arguments

[CdeMills]

I discussed the idea a few years ago. I think R interface is MUCH cleaner
through named arguments. OTOH when I tried to put on paper the idea behing
named args, make the distinction between positional and named arguments the
right way was everything but trivial. In the mean time, I settled upon:
function somefunc(pos1, pos2, pos3, varargin)


%#optionnal arguments
numarg = nargin - 3;

indopt = 1;
option_args = {'Method'; 'Corr'};

while (numarg)
  dummy = varargin{indopt++};
  if (!ischar (dummy))
    error ("somefunc: optional arg %d at pos %d is not a string", dummy,
indopt-1);
  endif
  switch (find (strcmpi (dummy, options_args)
  case 1
      Method = varargin{indopt};
   case 2
      Corr = varargin{indopt};
 otherwise
      unknown_par = varargin{indopt};
      warning ("pronysq: %s is not a known option", dummy);
  endswitch
  indopt++; numarg -= 2;
endwhile;

This way, arguments comes as pair (name, value). The name matching is case
insensitive, because forgetting the right uppercase/lowercase settings is
easy ...

Regards

Pascal

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