[Haskell-cafe] sorting and merging in haskell

Eugene Kirpichov ekirpichov at gmail.com
Tue Jan 19 04:28:40 EST 2010

Use the 'sortBy' and 'group' functions from Data.List. The rest is quite easy.
Or you might use a Data.Map (degree => coefficient), particularly the
fromListWith function.

2010/1/19 jjoshua <jjoshua2 at gmail.com>:
> So I defined a type called term which is a coefficient and degree of x. int a
> int b.
> I want to write a method/methods in haskell to sort them and combine ones
> with same degree. I think I need to combine somehow, and then use sortby
> method? I'm just learning haskell, but I now java and c# pretty well and I'm
> having a hard term converting to functional thinking.
> its of type [(Int a Int b)] and if b1< b2 put tuple 1 before tuple2, else if
> = combine by adding a1 to a2, else place 2 before 1. I know how to do it
> logically, just not the syntax I guess.
> Thanks so much guys!
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Eugene Kirpichov
Web IR developer, market.yandex.ru

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