Re: gp: gcd(0), tan(Pi/2) error messages unhelpful

[Igor Schein <igor@txc.com>]

On Tue, Jan 07, 2003 at 04:04:48AM +0100, Karim BELABAS wrote:
> On Mon, 6 Jan 2003, Michael Somos wrote:
> > ? gcd(0)
> >   ***   incorrect type in association.
> > ? \p29
> >    realprecision = 38 significant digits (29 digits displayed)
> > ? tan(Pi/2)
> >   ***   division by zero in R/R
> >
> > These error messages are unhelpful. In a program which calls these
> > in lower-level functions, it is not easy to figure out where these
> > error messages came from. While not bugs in 'gp' itself, they can
> > make finding bugs in user function difficult. Shalom, Michael
> 
> The second one is easy to fix:
> 
> (03:57) gp > tan(Pi/2)
>   ***   can't compute tan(Pi/2 + kPi).

          GP/PARI CALCULATOR Version 2.2.5 (development CHANGES-1.641)
                i686 running linux (ix86 kernel) 32-bit version
                (readline v4.3 enabled, extended help available)
? tan(Pi/2)
-39614081257132168796771975169.

Thanks

Igor