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Bill Allombert on Mon, 27 Nov 2023 14:12:52 +0100
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Re: #matr~ vs ##matr (and: arity, questenian and !!)
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- To: pari-dev@pari.math.u-bordeaux.fr
- Subject: Re: #matr~ vs ##matr (and: arity, questenian and !!)
- From: Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>
- Date: Mon, 27 Nov 2023 14:12:46 +0100
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On Sun, Nov 26, 2023 at 07:48:32PM -0800, Ilya Zakharevich wrote:
> On Fri, Feb 05, 2021 at 05:54:48AM -0800, Ilya Zakharevich wrote:
> > On Fri, Feb 05, 2021 at 05:46:43AM -0800, Ilya Zakharevich wrote:
> > > Is not it desirable to implement ##matr as an (optimized) synonym for #matr~?
> > >
> > > If the answer to the second question is positive, then one can maybe
> > > improve things by returning a special value (such as -1) for scalars…
> >
> > Well, to get things yet simpler, one can make ###x to return 0 for
> > scalars, 1 for vectors/lists and 2 for matrices.
>
> Taking all these things together, I think that in the best of the
> worlds one would have these:
>
> #mattr~ optimized in the compiler to (an equivalent to) (matsize(mattr))[1]
This one will not break backward compatibility while being easy to do.
See the new branch bill-translength.
? M=matrix(200,201,i,j,random(2^200));
? for(i=1,1000,#M~)
*** last result computed in 0 ms.
instead of
*** last result: cpu time 485 ms, real time 486 ms.
Cheers,
Bill