Re: pari-2.2.1.alpha released

[Ilya Zakharevich <ilya@math.ohio-state.edu>]

On Fri, Oct 26, 2001 at 12:34:04PM +0200, Karim BELABAS wrote:
> > Is it desirable to do The Right Thing?  make
> >
> >   subst(P, Q, y)
> >
> > a shortcut for
> >
> >   { subst_poly(pol, from, to) =
> >     local(t);
> >     subst(lift(Mod(pol,from-'t)),'t,to)
> >   }
> 
> Sure.

Then there is another feature which is badly missed: subst(a, [x,y], [z,t]).

BTW, is there a "better" semantic than doing substitutions
left-to-right?  Here "better" meaning one or more of "more
convenient", "more functionality", "less surprising".

Ilya

P.S.  Unrelated: is there a way to catch err()/error() from GP?
      Simple API to catch from PARI?