[Haskell-cafe] Generalized list-comprehension
yu- at div.club.ne.jp
Sun Feb 1 15:51:12 EST 2004
> I need to map(\x->otherFunction x) [1..], but this
> "next"-function is almost identical to what the
> built-in listcomprehension does.
> I just don't like my solution.
Sorry, I didn't read this.
You may prefer something like this to map (\x -> otherFunction x),
though mechanical translation:
xs = []:[[ y:z | y <- [1..n], z <- x] | x <- xs]
Hope it helps,
On Sun, 1 Feb 2004 15:22:01 +0900
Koji Nakahara <yu- at div.club.ne.jp> wrote:
> Another solution:
> f m n = concat $ take m $ tail xs
> xs = []:map (\x -> concatMap (\y -> map (y:) x) [1..n]) xs
> f 3 4 gives your f 4.
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