[Haskell-cafe] Fwd: Fwd: Re: the state of Yarr?

[Noon Silk]

> I am very excited that you are interested in this area; it often feels
> very lonely.

FWIW I would also be extremely excited/interested in a Haskell-themed numpy
package; I didn't know about yarr. Nice to see it!



On Wed, Jan 6, 2016 at 8:48 PM, Dominic Steinitz <dominic at steinitz.org>
wrote:

> A problem with my email prevented this making it on to the mailing list.
>
> Hi Petr,
>
> I am not actively developing Yarr but I would very much like to. I keep
> it from bit-rotting. The problem as always is finding time. On the other
> hand I don't think repa is very active e.g. upgrading to vector-0.11
> took a while to happen although clearly more active than me on Yarr!
>
> What I'd like is something like Python's numpy but safer and faster. If
> you look at the static module in the hmatrix package
> (
> https://hackage.haskell.org/package/hmatrix-0.17.0.1/docs/Numeric-LinearAlgebra-Static.html
> )
> you can see how type level literals can be used to prevent e.g.
> multiplying two inconsistent matrices together at compile time. I am
> sure we could do something better with either Yarr or repa (repa will
> currently give out of bounds errors at runtime).
>
> For reasons I don't understand (I think a bug in Haddock) the
> documentation does not get generated.
>
> There are examples of its use here:
> https://github.com/leventov/yarr/tree/master/tests. I wrote a blog using
> repa and Yarr here:
>
> https://idontgetoutmuch.wordpress.com/2013/08/06/planetary-simulation-with-excursions-in-symplectic-manifolds-6/
> and compare performance. You can safely ignore the theory and need only
> look at "Repa Implementation", "Yarr Implementation" and "Performance".
>
> I think performance will depend on your application. I believe (but
> haven't confirmed) that repa will outperform Yarr on e.g grid based
> problems such as numerical methods for diffusions and Poisson. In the
> case of planets (or stars or particles) where everything is influenced
> by everything else then repa is a bad fit and Yarr outperforms.
>
> If your application is linear algebra, I would think that hmatrix would
> have what you want or could be extended to give what you want since it
> is LAPACK under the covers.
>
> I am very excited that you are interested in this area; it often feels
> very lonely.
>
> Best wishes, Dominic.
>
>
> On 06/01/2016 09:10, Petr Pudlák wrote:
>
>> Hi Dominic,
>>
>> what is the current state of Yarr? Is it being actively developed? Is
>> there some tutorial or documentation available?
>>
>> I'm deciding between repa and yarr for some linear algebra
>> computations. I found some references that yarr is more performant,
>> but I couldn't find much documentation and the hackage page [1] hasn't
>> indexed most modules for some reason, so there seems to be no good
>> place to start from. And the last commit was 9 months ago.
>>
>> [1]https://hackage.haskell.org/package/yarr
>>
>> Thank you,
>> Petr
>>
>
>
>
>
>
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-- 
Noon Silk, ن

https://silky.github.io/

"Every morning when I wake up, I experience an exquisite joy — the joy
of being this signature."
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