Re: How to best dynamically make use of cypari2?

[hermann@stamm-wilbrandt.de]

On 2023-06-14 01:36, hermann@stamm-wilbrandt.de wrote:
> ...
> There is one problem left, which could be fixed by applying Pari 
> "lift()".
> But I needed to understand why "Mod(12, 19)" is returned, although 
> function
> result types seem to be the wanted type for the two "to_...()" 
> functions.
> What is going on here? I don't see "cypari2.gen.Gen" ...
>
> How can I make "to_sqrtm1(to_sum2sqs(12, 29), 29)" return just 12?
I found explanation

> > > from cypari2_ import *
> > > type(to_sum2sqs(12, 29))
pari
<class 'tuple'>
> > > type(to_sum2sqs(12, 29)[0])
pari
<class 'cypari2.gen.Gen'>
> > >

as well as solution: use "gen_to_python()" to convert "Gen" result to 
Python type:
https://cypari2.readthedocs.io/en/latest/convert.html#cypari2.convert.gen_to_python


I updated the cypari2_.py gist, now it works as it should:
https://gist.github.com/Hermann-SW/f17e58b2df76b64da63e50e7402765e0

Type "help", "copyright", "credits" or "license" for more information.
> > > from cypari2_ import *
> > > to_sqrtm1((6, -5), 61)
11
> > > to_sum2sqs(11, 61)
pari
(6, -5)
> > > to_sqrtm1(to_sum2sqs(11, 61), 61)
pari
11
> > > to_sum2sqs(to_sqrtm1((6, -5), 61), 61)
pari
(6, -5)
> > >


Regards,

Hermann.