Re: fix null assignment

[Jaroslav Hajek]

On Mon, Sep 22, 2008 at 8:39 PM, John W. Eaton <address@hidden> wrote:
> On 22-Sep-2008, Jaroslav Hajek wrote:
>
> | On Sat, Sep 20, 2008 at 6:09 AM, John W. Eaton <address@hidden> wrote:
> |
> | > I'd prefer to avoid adding a new assign_op.  I think we would have to
> | > be careful to also check for op_nul_asn_eq in each place where
> | > op_asn_eq is used and that is likely to cause confusion.
> |
> | Why? I think it would only require to register the handlers.
>
> I was just looking at the places where we check for op_asn_eq and
> thinking that it might be necessary to also check for op_nul_asn_eq,
> and that this could lead to a maintenance problem in the future.
>
> | Btw. I don't much like the fact that A(I,:) =[[;[];];] is also a null
> | assignment in Matlab; do we really want to copy this behaviour?
>
> No, I don't think it is necessary to have [] and [;] or [,] be exactly
> equivalent.  We could have [] (and, for strings, '' and "") be the
> only ways of specifying a special nul matrix.  But for compatibility,
> we should probably accept the [;] and [,] syntax.
>
> In any case, I don't think my patch is good enough to include at this
> point.  I'd be happy to consider your approach instead, if you are
> willing to write enough of a patch to show how it would be done.
>

I'll try something.


> Thanks,
>
> jwe
>



-- 
RNDr. Jaroslav Hajek
computing expert
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz