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

Georgi Guninski <[email protected]>
Newsgroups gmane.comp.mathematics.pari.devel
Message-ID <CAGUWgD_4hcATq3H3P4VyaXD1Yz1QrCvdsJSn=9O+MxES2ywVcA@mail.gmail.com>
On Sat, Jan 1, 2022 at 5:36 PM Karim Belabas
<[email protected]> 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>
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