From octave-maintainers-request at bevo dot che dot wisc dot edu Tue Dec 31 16:07:46 2002
Subject: Re: f(end) feature?
From: Paul Kienzle <pkienzle at jazz dot ncnr dot nist dot gov>
To: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
Cc: octave-maintainers at bevo dot che dot wisc dot edu
Date: Tue, 31 Dec 2002 17:07:43 -0500

On Tue, Dec 31, 2002 at 03:47:02PM -0600, John W. Eaton wrote:
> On 31-Dec-2002, Paul Kienzle <pkienzle at jazz dot ncnr dot nist dot gov> wrote:
> 
> | So I guess the following is out of the question:
> | 
> | 	function y = head(x)
> | 	    y = x(1:min(3,end));
> | 	end
> 
> Sorry, that's not what I intended, and it's not actually prevented by
> the previous patch, but min(3,end) would return -1, so you would not
> get the result you expect.  The following patch should help (I think).
> 
> With it and the previous patch:
> 
>   octave:1> function y = head (x) y = x(1:min(3,end)); end
>   octave:2> x = [1,2,3,4]
>   x =
> 
>     1  2  3  4
> 
>   octave:3> head (x)
>   ans =
> 
>     1  2  3
> 
> and
> 
>   octave:1> min (1,end)
>   error: __end__: internal error
>   error: evaluating argument list element number 2
> 
> 
> Is that better?

I'm impressed!  I still haven't figured out how you've done it.  Maybe
one day I'll give up and peek at the code.

- Paul