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Today's Topics:
1. Re: Avoiding stack space overflow (Animesh Saxena)
2. Re: Avoiding stack space overflow (Bob Ippolito)
3. Re: Saving intermediate calculations (Henk-Jan van Tuyl)
----------------------------------------------------------------------
Message: 1
Date: Tue, 10 Mar 2015 21:43:33 +0800
From: Animesh Saxena <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Avoiding stack space overflow
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
This is really nice stuff. Thanks
Animesh
Sent from my iPhone
> On 10-Mar-2015, at 5:49 pm, Heinrich Apfelmus <[email protected]>
> wrote:
>
> Bob Ippolito wrote:
>> On Mon, Mar 9, 2015 at 4:15 PM, Heinrich Apfelmus <[email protected]
>>> wrote:
>>> Bob Ippolito wrote:
>>>
>>>> Here are my go-to resources for Haskell's evaluation:
>>>>
>>>> http://chimera.labs.oreilly.com/books/1230000000929/ch02.
>>>> html#sec_par-eval-whnf
>>>> https://hackhands.com/lazy-evaluation-works-haskell/
>>> I just wanted to mention that I have now expanded the latter resource. It
>>> is best reached from the following URL:
>>>
>>> https://hackhands.com/guide-lazy-evaluation-haskell/
>> Thank you, this is great! Perhaps you could also link to this from the top
>> and/or bottom of each individual article to make them all more discoverable
>> from existing links?
>
> Good idea! I have added a link at the top of each post. Does this work as
> intended?
>
>
> Best regards,
> Heinrich Apfelmus
>
> --
> http://apfelmus.nfshost.com
>
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
------------------------------
Message: 2
Date: Tue, 10 Mar 2015 13:54:17 -0700
From: Bob Ippolito <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Avoiding stack space overflow
Message-ID:
<CACwMPm_Tg0WS=loiemejvexdhvsjwynuyec_tb89vkwda0-...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
On Tue, Mar 10, 2015 at 2:49 AM, Heinrich Apfelmus <
[email protected]> wrote:
> Bob Ippolito wrote:
>
>> On Mon, Mar 9, 2015 at 4:15 PM, Heinrich Apfelmus <
>> [email protected]
>>
>>> wrote:
>>>
>>
>> Bob Ippolito wrote:
>>>
>>> Here are my go-to resources for Haskell's evaluation:
>>>>
>>>> http://chimera.labs.oreilly.com/books/1230000000929/ch02.
>>>> html#sec_par-eval-whnf
>>>> https://hackhands.com/lazy-evaluation-works-haskell/
>>>>
>>>> I just wanted to mention that I have now expanded the latter resource.
>>> It
>>> is best reached from the following URL:
>>>
>>> https://hackhands.com/guide-lazy-evaluation-haskell/
>>>
>>
>>
>> Thank you, this is great! Perhaps you could also link to this from the top
>> and/or bottom of each individual article to make them all more
>> discoverable
>> from existing links?
>>
>
> Good idea! I have added a link at the top of each post. Does this work as
> intended?
Absolutely, works perfectly!
-bob
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Message: 3
Date: Wed, 11 Mar 2015 01:05:10 +0100
From: "Henk-Jan van Tuyl" <[email protected]>
To: "[email protected]" <[email protected]>, "Abhinav
Kalawatia" <[email protected]>
Subject: Re: [Haskell-beginners] Saving intermediate calculations
Message-ID: <op.xva3u0gypz0j5l@alquantor>
Content-Type: text/plain; charset=iso-8859-15; format=flowed;
delsp=yes
On Mon, 09 Mar 2015 16:47:06 +0100, Abhinav Kalawatia
<[email protected]> wrote:
:
> week actual_ sales(a) forecast(f)
> forecast(f) forecast(f)
> 1 20 f1 = a1
> f1 = 20
> f1 = 20
> 2 27 f2 = f1 + 0.5*(a1 - f1)
> f2 = 20 +0.5(20-20) f2 = 20
> 3 25 f3 = f2 + 0.5*(a2-f2)
> f3 = 20+0.5*(27-20) f3=23.5
> 4 22
>
>
> When I execute a function to achieve this in Haskell, I get the forecast
> for the fourth period. Can I save the values for intermediate
> period(1..3) also?
>
>
> Please find my Haskell code below:
> a = 0.5
> ipt = [20,27,25,22]
> avg :: [Double] -> Double
> avg (x:xs) = (a*x) + (1-a)*(avg xs)
> avg [] = 0
:
It looks to me, that mapAccumL[0] might do the trick (I haven't studied
this in detail).
Regards,
Henk-Jan van Tuyl
[0]
http://haddocks.fpcomplete.com/fp/7.8/20140916-162/base/Data-List.html#v:mapAccumL
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