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Today's Topics:
1. Re: Parallel processing... (David McBride)
2. Re: Parallel processing... (mike h)
3. Suggestions for way to improve / clean up this code?
(Erik Tillett)
4. Re: Suggestions for way to improve / clean up this code?
(Francesco Ariis)
----------------------------------------------------------------------
Message: 1
Date: Mon, 27 Mar 2017 08:21:19 -0400
From: David McBride <toa...@gmail.com>
To: mike h <mike_k_hough...@yahoo.co.uk>, The Haskell-Beginners
Mailing List - Discussion of primarily beginner-level topics related
to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] Parallel processing...
Message-ID:
<can+tr40c-p7wpksj6dz59vc9xc7mjg6vi-8b_sqmrehm96y...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
It's hard to say what level you'll want your libraries to be.
Theoretically all the functionality you need is in base.
Control.Parallel and Control.Concurrent have functions for that,
although you'll have to learn how to use them from various tutorials
around.
If the function you are mapping is pure, you might try the parallel
package. If it is monadic you might try the monad-par package. There
are parMap and parFor functions in monad-par-extras package which do
exactly what you are looking for.
If you search for parallel on hackage you'll find a plethora of well
maintained packages in this domain as it is one of those things
haskell is best at.
On Mon, Mar 27, 2017 at 7:04 AM, mike h <mike_k_hough...@yahoo.co.uk> wrote:
> Hi,
>
> I have a list of lists - a grid [[ ]] of complex numbers and I map a
> function over each number in the grid. Each computation on a value at (r, c)
> is independent of any and all other calculations. This strikes me as being
> something that can be done in parallel by creating , say 4 quadrants and
> mapping over each and combining when done, or doing each row in parallel
> etc. etc.
>
> So I'm really just asking for advice or pointers on the Haskell libraries
> etc that I should start with but I'm not really looking to import an
> uber-package that will do most of it for me. I want to learn a little more
> Haskell by working from a few concurrency primitives.
>
> Thanks
>
> Mike
>
>
> _______________________________________________
> Beginners mailing list
> Beginners@haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
------------------------------
Message: 2
Date: Mon, 27 Mar 2017 18:05:52 +0100
From: mike h <mike_k_hough...@yahoo.co.uk>
To: David McBride <toa...@gmail.com>
Cc: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] Parallel processing...
Message-ID: <fb66db09-aec0-42c8-b7ba-47c3d3bb8...@yahoo.co.uk>
Content-Type: text/plain; charset=utf-8
Thanks David, I’ll look in to the links.
Mike
> On 27 Mar 2017, at 13:21, David McBride <toa...@gmail.com> wrote:
>
> It's hard to say what level you'll want your libraries to be.
> Theoretically all the functionality you need is in base.
> Control.Parallel and Control.Concurrent have functions for that,
> although you'll have to learn how to use them from various tutorials
> around.
>
> If the function you are mapping is pure, you might try the parallel
> package. If it is monadic you might try the monad-par package. There
> are parMap and parFor functions in monad-par-extras package which do
> exactly what you are looking for.
>
> If you search for parallel on hackage you'll find a plethora of well
> maintained packages in this domain as it is one of those things
> haskell is best at.
>
> On Mon, Mar 27, 2017 at 7:04 AM, mike h <mike_k_hough...@yahoo.co.uk> wrote:
>> Hi,
>>
>> I have a list of lists - a grid [[ ]] of complex numbers and I map a
>> function over each number in the grid. Each computation on a value at (r, c)
>> is independent of any and all other calculations. This strikes me as being
>> something that can be done in parallel by creating , say 4 quadrants and
>> mapping over each and combining when done, or doing each row in parallel
>> etc. etc.
>>
>> So I'm really just asking for advice or pointers on the Haskell libraries
>> etc that I should start with but I'm not really looking to import an
>> uber-package that will do most of it for me. I want to learn a little more
>> Haskell by working from a few concurrency primitives.
>>
>> Thanks
>>
>> Mike
>>
>>
>> _______________________________________________
>> Beginners mailing list
>> Beginners@haskell.org
>> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>>
------------------------------
Message: 3
Date: Mon, 27 Mar 2017 19:54:55 -0400
From: Erik Tillett <erik.till...@gmail.com>
To: beginners@haskell.org
Subject: [Haskell-beginners] Suggestions for way to improve / clean up
this code?
Message-ID:
<CAKZCEDnr2A2tcDb7S62W151eg_zSFyw8kGjwTivydMGyT=b...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
I'm looking for sugestions on how to better structure this code. I stuck
it in a pastbin:
https://pastebin.com/gQFmvq6W/
Would a State monad help?
Thanks!
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Message: 4
Date: Tue, 28 Mar 2017 02:46:26 +0200
From: Francesco Ariis <fa...@ariis.it>
To: beginners@haskell.org
Subject: Re: [Haskell-beginners] Suggestions for way to improve /
clean up this code?
Message-ID: <20170328004626.ga17...@casa.casa>
Content-Type: text/plain; charset=utf-8
On Mon, Mar 27, 2017 at 07:54:55PM -0400, Erik Tillett wrote:
> I'm looking for sugestions on how to better structure this code. I stuck
> it in a pastbin:
>
> https://pastebin.com/gQFmvq6W/
>
> Would a State monad help?
>
> Thanks!
Hello Erik,
a couple of notes:
- boolToInt is the same as `fromEnum`
λ> :t fromEnum
fromEnum :: Enum a => a -> Int
- there are a lot of redundant brackets, like
if (zReg c) then c{pc = address} else c
^ ^
minor errors like this are easily caught by hlint
As for the state monad: you are correctly using monads to capture
the idea of "things that can fail" (Either), judging by the function
signatures I don't see the need for a State monad (i.e. I don't
see signatures that end in (Something, SomeResult).
(or maybe I am misreading the code, in that case please fire again)
------------------------------
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