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Bill Allombert on Thu, 12 Dec 2024 19:24:44 +0100
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Re: Is this the way to use auxiliary variables in vector initialized via multiple iterators?
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- To: pari-users@pari.math.u-bordeaux.fr
- Subject: Re: Is this the way to use auxiliary variables in vector initialized via multiple iterators?
- From: Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>
- Date: Thu, 12 Dec 2024 19:24:40 +0100
- Delivery-date: Thu, 12 Dec 2024 19:24:45 +0100
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- In-reply-to: <aedc5877d37d87f01df04b099964c84d@stamm-wilbrandt.de>
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On Wed, Dec 11, 2024 at 10:16:27PM +0100, hermann@stamm-wilbrandt.de wrote:
> Doc talks about
> https://pari.math.u-bordeaux.fr/pub/pari/manuals/2.17.0/users.pdf#page=25
>
> "To iterate over more than one variable, you may separate clauses with ; as
> in"
>
> I found no mentioning how to introduce auxiliary variables to avoid
> repetition of terms.
>
> I wanted to use auxiliary variable s for sum p^2+4*q^2, and this does the
> job:
>
> ? P=primes([2,100]);vecmin([s|p<-P;q<-P;s<-[p^2+4*q^2],isprime(s)])
> 41
> ?
>
> Is there another way of assignment to s without having to introduce
> auxiliary single element set?
No, but frankly I think this is fine like this.
Cheers,
Bill.