Re: possible request for new function to elliptic curves section

[American Citizen <website.reader3@gmail.com>]

Thank you Bill for that reply:

I don't know whether to feel foolish at my 73 year old age... when I did 
do the ?12 input to GP Pari to see all the elliptic curve functions and 
didn't recognize this function, or just admit that I'm not at the top of 
my game? (laugh)

This is exactly what I need for doing research on Heron triangles with 3 
square sides.

Randall


On 10/12/24 13:36, Bill Allombert wrote:
> On Sat, Oct 12, 2024 at 01:26:15PM -0700, American Citizen wrote:
> > Would it be possible to have a new function added to GP Pari, such that
> > supplying just the x-coordinate for an elliptic curve would return a 0 or a
> > 1 depending upon whether or not x is a legitimate value?
> Use ellordinate !
>
> ??ellordinate
> ellordinate(E,x):
>
>     Gives a 0, 1 or 2-component vector containing the y-coordinates of the points of the curve E having x as x-coordinate.
>
> Cheers,
> Bill.