[Gretl-devel] Re: [Gretl-users] vertical matrix concatenation (was matrix declaration error)

[Allin Cottrell]

On Tue, 30 Jan 2007, Riccardo (Jack) Lucchetti wrote:

> X = (a ~ b') ~' ( c ~' d)
>
> and
>
> X = (a ~' b') ~' ( c' ~ d)
>
> are not immediate to tell apart.

Yikes, no, I don't like that.

> Hence, my counter-proposal (which, I admit, does have drawbacks, 
> but is still preferable IMHO): use "|" for vertical 
> concatenation and switch to "&&" and "||" for logical operators. 
> It will break existing syntax, but it'd be better in the long 
> run.

That does make sense, but I'm a bit reluctant to change the 
meaning of logical "&" and "|" right now -- though we could do 
that later with fair warning.

How about '#' for now?  It's not pretty (or standard), but it 
shouldn't collide with anything and is visually distinctive.

Allin