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Jacques Gélinas on Mon, 20 Jul 2020 03:39:46 +0200
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Re: Feature suggestion: "ifcmp" convenience control statement
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- To: "pari-users@pari.math.u-bordeaux.fr" <pari-users@pari.math.u-bordeaux.fr>
- Subject: Re: Feature suggestion: "ifcmp" convenience control statement
- From: Jacques Gélinas <jacquesg00@hotmail.com>
- Date: Mon, 20 Jul 2020 01:39:41 +0000
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- Thread-topic: Feature suggestion: "ifcmp" convenience control statement
Sometimes, I use many comparisons like this polynomial coefficient
depending on global variables
$ ak(k=0,d='d)={ if(
BESS==1,1/prod(j=1,k,1+d/(2*j-1)),
MIKE==1,1/prod(j=1,k-1,prod(i=1,j,1+d/(2*i+1))),
MIK==1,prod(j=1,k,prod(i=1,j,(2*i-1)/(d+2*i-1))),
RK==1,prod(j=1,k,(2*j-1)*rks(j)^(k-j)),
AKX==1,akx(k,d),
eval(Str("a"k)));} \\ general case
Jacques Gélinas
De : Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>
Envoyé : 19 juillet 2020 17:24
À : pari-users@pari.math.u-bordeaux.fr <pari-users@pari.math.u-bordeaux.fr>
Objet : Re: Feature suggestion: "ifcmp" convenience control statement
On Sun, Jul 19, 2020 at 04:00:23PM -0500, Hans L wrote:
> When writing functions in gp, I think it is fairly common to need to
> do 3 different things depending on a comparison of two values.
> This can of course be done with nested if() but it feels verbose and
> can get messy depending on how complicated the terms are:
> if(a<b, do_lt(), if(a>b, do_gt(), do_eq() ))
You can do
if(a<b, do_lt(), a>b, do_gt(), do_eq())
Cheers,
Bill.