Re: getopt

[Ben Abbott]

On Oct 10, 2009, at 5:16 PM, Juergen Rose wrote:

> Am Samstag, den 10.10.2009, 10:48 +0000 schrieb address@hidden:
> > did you see   varargin?
> >
> > Doug
> >
> > > Subject: getopt
> > > From: address@hidden
> > > To: address@hidden
> > > Date: Sat, 10 Oct 2009 19:55:35 +0200
> > >
> > > Hi,
> > >
> > > I am looking for a possibility to evaluate the arguments passed to a
> > > octave script similar to getopt[s] in bash or Getopt::Std in perl.
> > >
> > > Any hints are appreciated.
>
> Hi Doug,
>
> I don't understand, what 'varargin' has to do with 'getopt'.
>
> octave:1> help varargin
>
> -- Keyword: varargin
>     Pass an arbitrary number of arguments into a function.
>
>     See also: varargout, nargin, nargout
>
> I need a function, which I can use to parse arg_list = argv() and  
> which
> can distinguish between allowed and not allowed options, and between
> options with and without additional parameter.
> I.e., I look for something like in Perl:
>
> use Getopt::Std;
> my $opts="dhS:o:N:n:";
> my $options={};
> getopts($opts,$options);
> if (defined $options->{d}) {$DBG_LVL=$options->{d};}
> if (defined $options->{h}) {usage();   exit 0;}
> if (defined $options->{S}) {$Seed=$options->{S};}
> ..
>
> Regards Juergen

Within a function ...

        nargin = the number of arguments passed.
        varargin{n} = the nth argument

The variables nargout and vargout are the output counterparts.

Below is a very simple example illustrating how varargin works.

octave:1> function test_varargin (varargin)
> varargin{:}
> end
octave:2> test_varargin (1, 2, 3, "a", "b", "c")
ans =  1
ans =  2
ans =  3
ans = a
ans = b
ans = c
octave:3>

Ben