Re: Need some help with Oct files

[Michael Creel]

John W. Eaton wrote:
> On  5-Sep-2006, Michael Creel wrote:
>
> | You need to return an octave_list_value. Something like the following 
> | (taken from samin.cc in octave-forge):
> | 
> | 	f_return(0) = xopt;
> |       f_return(1) = fopt;
> |       f_return(2) = converge;
> |       return octave_value_list(f_return);
>
> More like
>
>   octave_value_list retval;
>
>   retval(2) = converge;
>   retval(1) = fopt;
>   retval(0) = xopt;
>
>   return retval;
>
> Since the list has to be declared before it can be used.
>
> The () operator forces a resize of the list automatically, so loading
> the values in reverse order requires just one resize.
>
> jwe

That's interesting. Of course, samin.cc makes the declaration in the 
part that is omitted - I pointed Philip to a specific file so he can 
get a working example. But I hadn't thought of the ordering affecting 
the number of resizings. Would the reverse order be expected to have a 
noticeable effect on the time it takes the function to evaluate? I'm 
guessing that this would only be the case if the things in the list 
used substantial memory or if it were called frequently. Is that correct?