Re: Using hexadecimal with gp

["Martin Larsen" <mrtnlrsn@hotmail.com>]

> Hello everybody,
> I'm trying to use the GP calculator in order to evaluate the
> expression X^N mod N
>
> I'm able to evaluate this expression, however I would like to use, as
> input to the Mod( ) number expressed in hexadecimal notation.
> However I tried
> Mod(0x77, 0x11),
> Mod(77h, 11h)
> but none of this notation is accepted.
> I searched for hex on the pdf file provided as help with pari, but I
> wasn't able to find reference to this aspect.
> Any help will be appreciated.

Maybe this would work:

hextodec(s)=
{local(v=Vecsmall(s),
sett=Set([0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f]));
sum(i=0,#v-1,(setsearch(sett,Strchr(bitor(v[#v-i],32)))-1)*16^i)}

Regards
Martin