Georgi Guninski on Sat, 01 Jan 2022 19:11:15 +0100


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Re: Error in qfauto() && Happy New Year 

On Sat, Jan 1, 2022 at 5:36 PM Karim Belabas
<Karim.Belabas@math.u-bordeaux.fr> wrote:

>
> Bad Input Bug: M1 must be a positive definite quadratic form, but
>
> (16:33) gp > qfsign(M1)
> %1 = [7, 3]
>

Looks like there is some protection against PD:

? M0=[1,0;0,0];qfauto(M0,M0)
  ***   at top-level: M0=[1,0;0,0];qfauto(M0,M0)
  ***                              ^-------------
  *** qfauto: domain error in qfisom: form is not positive definite
  ***   Break loop: type 'break' to go back to GP prompt
break>