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Today's Topics:
1. Re: set multiplication (Christian Maeder)
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Message: 1
Date: Tue, 08 Apr 2014 09:06:29 +0200
From: Christian Maeder <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] set multiplication
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Some time ago I discovered that the monadic "sequence" function operates
quite interestingly on lists. I don't know why you call it
multiplication. I was looking for something like combinations:
Prelude> sequence [[1,2,3], [4,5], [6,7]]
HTH Christian
Am 08.04.2014 07:00, schrieb Nishant:
>
> hi,
>
> I am trying to implement a set multiplication program in haskell.
>
> Input : [1,2,3] [4,5] [6,7]
> Ouput : [ [1,4,6] , [1,4,7] , [1,5,6] , [1,5,7] ...]
>
>
> I implemented it for constant number of inputs like
>
> setMul xs ys zs = [ [x] ++ [y] ++ [z] | x <- xs , y<-ys ,z <- zs]
>
> I am not able to generalize this for any number of lists.
>
> type signature would be :
>
> setMulMany :: [[a]] -> [[a]]
>
> Example :
>
> Input : [ [1,2,3] , [4,5] , [6,7]]
> Ouput : [ [1,4,6] , [1,4,7] , [1,5,6] , [1,5,7] ...]
>
>
> Regards.
> Nishant
>
>
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