Re: Memory management in .oct files

[Richard Hindmarsh]

John W. Eaton wrote:

> On 19-Mar-2005, Richard Hindmarsh <address@hidden> wrote:
>
> | I guess this means that you decided not to impelemt e.g.
> | 
> |      xout1(ic1,ir1) = xin1(ir1,ic1); 
> | 
> | using a helper class.
>
> In what way are you suggesting using a "helper class" and what do you
> mean by that?
>  
I learnt the technique from

From: Corey Kosak 
<http://groups.google.co.uk/groups?hl=en&lr=&safe=off&q=author:kosak%40adonis.nectar.cs.cmu.edu+> 
(address@hidden <mailto:kosak%40adonis.nectar.cs.cmu.edu>)
Subject: Re: operator[] - lvalue and rvalue
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Newsgroups: comp.lang.c++.moderated 
<http://groups.google.co.uk/groups?hl=en&lr=&safe=off&group=comp.lang.c%2B%2B.moderated>, 
comp.lang.c++ 
<http://groups.google.co.uk/groups?hl=en&lr=&safe=off&group=comp.lang.c%2B%2B>
Date: 1998/11/22

This is the only way I know to distinguish an lvalue from a rvalue - 
maybe there are some others?

> | The upside of this is speed; the downside is that statements such as
> | 
> |       double y = xin1(ir+1,ic+1);
> | 
> | do not trip an error
>
>  
I meant this to be equivalent to

double y = xin1(end+1,end+1)

which should trip an error.

I also noticed that the Matrix class is zero-based.

> I think you are looking for
> the set_index, index and assign methods in the Array classes.  I would
> bet that you will not like the interface much, but it seemed to be
> what I needed for the implementation of the scripting language way
> back when, and it seems that so far, no one has contributed the code
> to do it in a better way.
>
>  
I am looking for an alternative to the Matlab C++ library, which 
Mathworks have stopped supporting. This has several desrable features 
from an Octave users point of view. I wrote a matrix class with my ideal 
properties (including helper classes) but got to the point where it was 
exposing my deficiencies as a C++ programmer.  It looks as though to 
recreate the Matlab C++ library one would have to inherit a further 
class from Array or Matrix with lvalue/rvalue distinction as above and 
one-based indexing etc. There are quite a few Matrix C++ classes about, 
but it's not clear what their long-term survival prospects are. One 
based on Octave would be much more convincing.

R



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