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Today's Topics:
1. Re: repetition (Thomas Davie)
2. Re: repetition (Luca Ciciriello)
3. Re: repetition (Luca Ciciriello)
4. Re: repetition (Henk-Jan van Tuyl)
----------------------------------------------------------------------
Message: 1
Date: Thu, 4 Aug 2011 10:39:18 +0100
From: Thomas Davie <[email protected]>
Subject: Re: [Haskell-beginners] repetition
To: Lyndon Maydwell <[email protected]>
Cc: [email protected]
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
On 4 Aug 2011, at 10:36, Lyndon Maydwell wrote:
> nub
Heh, our differing answers point out an ambiguity in the question.
Luca, given [5,10,10,5] what is this function expected to produce?
if you want [5,10] then nub is correct.
if you want [5,10,5] then map head . group is correct.
Bob
------------------------------
Message: 2
Date: Thu, 4 Aug 2011 11:41:34 +0200
From: Luca Ciciriello <[email protected]>
Subject: Re: [Haskell-beginners] repetition
To: Thomas Davie <[email protected]>
Cc: [email protected]
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
Thanks.
Luca.
On Aug 4, 2011, at 11:33 AM, Thomas Davie wrote:
>
> On 4 Aug 2011, at 10:31, Luca Ciciriello wrote:
>
>> Hi All.
>> Is there any function in Prelude that removes the repeated elements in a
>> list?
>>
>> In example I've a list like this one: xs =
>> ["3","3","3","3","3","4","4","4","4","4","5","5","5","5","5","6","6","6","6","6","6","6"]
>>
>> I need a function f such that f xs = ["3","4","5","6"]
>>
>> thanks in advance for any answer.
>
> map head . group
>
> Bob
------------------------------
Message: 3
Date: Thu, 4 Aug 2011 11:44:31 +0200
From: Luca Ciciriello <[email protected]>
Subject: Re: [Haskell-beginners] repetition
To: Thomas Davie <[email protected]>
Cc: [email protected]
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
My mistake, I haven't specified that the starting list is ordered.
Luca
On Aug 4, 2011, at 11:39 AM, Thomas Davie wrote:
>
> On 4 Aug 2011, at 10:36, Lyndon Maydwell wrote:
>
>> nub
>
> Heh, our differing answers point out an ambiguity in the question.
>
> Luca, given [5,10,10,5] what is this function expected to produce?
>
> if you want [5,10] then nub is correct.
> if you want [5,10,5] then map head . group is correct.
>
> Bob
>
------------------------------
Message: 4
Date: Thu, 04 Aug 2011 11:53:09 +0200
From: "Henk-Jan van Tuyl" <[email protected]>
Subject: Re: [Haskell-beginners] repetition
To: [email protected], "Luca Ciciriello"
<[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset=iso-8859-15; format=flowed;
delsp=yes
On Thu, 04 Aug 2011 11:31:02 +0200, Luca Ciciriello
<[email protected]> wrote:
> Hi All.
> Is there any function in Prelude that removes the repeated elements in a
> list?
>
> In example I've a list like this one: xs =
> ["3","3","3","3","3","4","4","4","4","4","5","5","5","5","5","6","6","6","6","6","6","6"]
>
> I need a function f such that f xs = ["3","4","5","6"]
>
Not in Prelude, but in Data.List:
nub
Prelude Data.List> nub
["3","3","3","3","3","4","4","4","4","4","5","5","5","5","5","6","6","6","6","6","6","6"]
["3","4","5","6"]
Regards,
Henk-Jan van Tuyl
--
http://Van.Tuyl.eu/
http://members.chello.nl/hjgtuyl/tourdemonad.html
--
------------------------------
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