haskell question

satori@sanitarium · 10-20-2009, 07:50 AM

I just started to learn haskell and I just came to my first wtf moment.

I'm trying to do something like this:

calling:
foo 3 [1,2,3,2,4,1,6,3,6,2,3,5,2,5,2,1,6,4]

returns:
[[1,2,3],[2,4,1,6,3],[2,3]]

but i have no idea how to put something into a sublist.

How to make a list of sublists out of a list, whether they be a list of numbers or a string.

TX in advance.

Telemachos · 10-20-2009, 05:35 PM

I don't know a ton about Haskell, but before anything else, can you please clarify what you want to happen here?

What determines which elements (or how many elements) end up in which of the sub-arrays? Why did the values 5, 2, 5, 2, 1, 6, 4 simply drop off the result? What's the logic of the function? As an example of what I mean, both take and drop operate on lists: take selects the first n items of the list and drop removes the first n items.

Code:

Prelude> take 5[1,2,3,4,5,6,7,8,9,10]
[1,2,3,4,5]
Prelude> drop 5[1,2,3,4,5,6,7,8,9,10]
[6,7,8,9,10]
Prelude> drop 2[1,2,3,4,5,6,7,8,9,10]
[3,4,5,6,7,8,9,10]

What is the foo function supposed to do exactly?