From help-octave-request at bevo dot che dot wisc dot edu Thu Jan 29 10:41:00 2004
Subject: Re: varargout form a DLD function
From: =?iso-8859-1?b?U/hyZW4=?= Hauberg <soren at hauberg dot org>
To: Shai Ayal <shaia at biocontrol dot co dot il>
Cc: Help-Octave List <help-octave at bevo dot che dot wisc dot edu>
Date: Thu, 29 Jan 2004 17:54:31 +0100

Hi
I'm new to liboctave (and octave), but the way I understand it nargout tells you
the number og requested output arguments.
If you (in octave) do:
[a b c] = test_arg()
then nargout will be 3.
So just change your code to:

    octave_value_list retval;
    for(int i=0;i<nargout;i++) retval(i)=i;
    return retval;

Then things should work (if I uinderstood your problem correctly)

Soren Hauberg

Citat Shai Ayal <shaia at biocontrol dot co dot il>:

> Hi all,
>
> I am trying to return a variable number of arguments from a DLD function
>
> //-------------------------------------------------
> #include "oct.h"
> DEFUN_DLD (test_arg, args, nargout,"")
> {
>    octave_value_list retval;
>
>    for(int i=0;i<5;i++) retval(i)=i;
>
>    nargout = 5;
>    return retval;
> }
> //-------------------------------------------------
>
>
> however, I cannot recover these arguments at the command line:
>
> GNU Octave, version 2.1.50 (i686-pc-linux-gnu).
> octave:1> test_arg()
> ans = 0
> octave:2> a{:}=test_arg()
> a =
> {
>    [1,1] = 0
> }
> octave:3> b=test_arg()
> b = 0
> octave:4> [a,b,c]=test_arg()
> a = 0
> b = 1
> c = 2
>
> Note that if I know the number of arguments I can get them as in line 4.
> but what if I don't know beforehand ? Is there something similar to
> varargin{:} for output arguments ?
>
> 	Shai
>
>


--
Knibling, det gode gamle håndværk med "pinde", er rigtig kommet på mode igen



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