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Mathematical functions with multiple arguments

haskell-cafe - Wed, 03/11/2015 - 10:45pm
Hi everybody, I have a function of type plot :: ([Double] -> Double) -- A function to plot -> [(Double, Double)] -- Range for all arguments -> IO () I want to enforce the fact that ranges for all arguments should be provided. Is there a way to make the type system enforce it?
Categories: Offsite Discussion

My first big Haskell project

Haskell on Reddit - Wed, 03/11/2015 - 8:54pm

Hey guys,

I was just looking back at my first big Haskell project, which you can find here:

It's a small "A.I." which creates music through a genetic algorithms. I put a couple of the tunes it made at various points online at ( plus one now as a "restart", be careful of your years on the earliest ones!).

Looking back on this code, it's a bit embarrassing now, so I was wondering, what have you guys learnt looking back at your first big projects?

submitted by julek1024
[link] [17 comments]
Categories: Incoming News

What imperative languages do Haskellers like?

Haskell on Reddit - Wed, 03/11/2015 - 6:24pm

Now that I've been using Haskell for almost a year I find going back to imperative languages incredibly frustrating. I went and brushed up on my Python and the biggest problem I had with it was how verbose it is (which frustrated me more than the lack of compile time optimisation or type safety...).

For various reasons I'm finding JavaScript to be quite nice. The syntax is reasonably lean, there are higher order functions and I can take lessons from Haskell about mutable state. Duck Typing is annoying, as is the lack of compile time assurance and the largely poor performance. I certainly wouldn't do anything more than client side functionality for web.

I realise that what I'm really liking about Haskell more than anything is how terse it is. Once you understand the syntax it's not just quick to write but it's easy to understand.

I've seen a bit of J around and it looks like it might push that a bit far. Anyone have any experience with it? Once you understand the syntax is it possible to decipher what someone else's code means or is it a "write only language"?

What imperative languages do Haskellers out there like?

submitted by TheCriticalSkeptic
[link] [84 comments]
Categories: Incoming News

References on haskellwiki

haskell-cafe - Wed, 03/11/2015 - 5:21pm
Hi, I've begun to do some formatting on old Monad Readers editions on Haskell Wiki. Unfortunately, there is no support for proper references support. Can the admin add the "Cite" extension ? It would help a lot. Thanks
Categories: Offsite Discussion

Where is Haskell Weekly News syndicated?

haskell-cafe - Wed, 03/11/2015 - 4:25pm
Haskell Weekly News used to be syndicated on and sequence only has HWN up to March 2010, while contemplatecode goes up to the beginning of February. Is there any way that I can subscribe to HWN (preferably as RSS/Atom), and not other stuff that doesn't interest me? -- View this message in context: Sent from the Haskell - Haskell-Cafe mailing list archive at
Categories: Offsite Discussion

Proposal: Export cycleN from Data.Sequence

libraries list - Wed, 03/11/2015 - 4:14pm
Yesterday I rewrote `*>` for Data.Sequence (again), using an internal function cycleN :: Int -> Seq a -> Seq a The name of the function is based on that of Data.Sequence.iterateN. cycleN takes a sequence and cycles it as many times as requested: cycleN 0 $ fromList [1,2] = [] cycleN 5 $ fromList [1,2] = [1,2,1,2,1,2,1,2,1,2] The function is written to maximize sharing in the result sequence and to minimize construction time. Specifically, cycleN n xs should take something like O(|xs| + log n) space (of which all but O(log |xs| + log n) is shared with the structure of xs) and O(log |xs| + log n) time. With current (on GitHub) Data.Sequence exports, the only way to get this functionality with these time and space bounds is to combine replicate with *> : cycleN n xs = replicate n () *> xs This strikes me as a bit unpleasant. David
Categories: Offsite Discussion - Wed, 03/11/2015 - 1:49pm
Categories: Offsite Blogs

Frege Goodness - Wed, 03/11/2015 - 9:39am
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tpolecat - Wed, 03/11/2015 - 9:36am
Categories: Offsite Blogs

-staticlib flag for building standalone static libraries producing very large libraries

glasgow-user - Sat, 03/07/2015 - 1:18pm
Hi all, Can anyone explain the following problem I'm having? I'm currently writing a game in Haskell. When I produce a plain old executable (for local testing) it's about 23M. However, when I create a static lib using the -staticlib flag it is 54M. Why the discrepancy? Sean _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users< at >
Categories: Offsite Discussion

New gtk2hs 0.12.4 release

gtk2hs - Wed, 11/21/2012 - 12:56pm

Thanks to John Lato and Duncan Coutts for the latest bugfix release! The latest packages should be buildable on GHC 7.6, and the cairo package should behave a bit nicer in ghci on Windows. Thanks to all!


Categories: Incoming News