[Jprogramming] cross product

[bill lam]

I encountered a case in which
$map = 200000 20000
Density of map is 0.004%

map is already sparse otherwise it will run into out-of-memory error
readily.


On Thu, Sep 23, 2021, 11:07 PM 'Michael Day' via Programming <
programming at jsoftware.com> wrote:

> Henry's comment just now explains the difference in performance,   I
> should think.
>
> Bill hasn't yet told us the ones-density or matrix-size.
>
> Anyway,
> Engine: j903/j64avx2/windows
> Beta-q: commercial/2021-09-14T15:38:42
> Library: 9.03.06
> Qt IDE: 1.9.3/5.15.2(5.15.2)
> Platform: Win 64
> Installer: J903 install
> InstallPath: c:/d/j903-beta
> Contact: www.jsoftware.com
>
> Cheers,
>
> Mike
>
>
> On 23/09/2021 15:53, Raul Miller wrote:
> > Possibly special code. Which version of J were you using?
> >
> > (I haven't benchmarked any of this myself. I probably should...)
> >
> > Thanks,
> >
>
>
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