Re: [Haskell-cafe] A new code search engine
lang:haskell seems to work just fine for me. On 2/14/07, Adam Peacock [EMAIL PROTECTED] wrote: On 2/14/07, Stephane Bortzmeyer [EMAIL PROTECTED] wrote: http://www.krugle.com/ Unlike Google, you can specify Haskell as a language. It is true that you can't directly specify the programming language with Google. But you can specify the filetype, i.e. hs or lhs, with Google. To do this, just add `filetype:hs` to you search. And according to my initial tests, Google still wins. Adam ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Summer of Code
Google just announced the 2007 SoC http://code.google.com/soc/ On 2/15/07, Chris Kuklewicz [EMAIL PROTECTED] wrote: Donald Bruce Stewart wrote: If anyone *can* make HsJudy install and work, could you put this information on the haskell wiki? -- Chris I'd just ping the auhtor, host the repo on darcs.haskell.org, and then fix it until it builds like any normal cabalised repo. It really could be a Data.HashTable killer, given a bit of build infrastructure love :-) -- Don I kludged an install that makes it work in ghci now. But I don't have a tested recipe for this yet. Even downloading from the pugs repository was tricky. I could not see how to use darcs to get just HsJudy (when I tried to do so darcs was grabbing 3k patches (using --partial!)). So use wget --no-parent -r, which is hardly a step I could put in a general recipe. -- Chris ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Fibonacci numbers generator in Haskell
I guess I don't get any points for an approximate solution, ay? Is there anything that can be done (easily) to reduce the rounding errors? On 6/15/06 11:23 PM, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: G'day all. Quoting Mathew Mills [EMAIL PROTECTED]: How about the closed form ;) -- fib x returns the x'th number in the fib sequence fib :: Integer - Integer fib x = let phi = ( 1 + sqrt 5 ) / 2 in truncate( ( 1 / sqrt 5 ) * ( phi ^ x - phi' ^ x ) ) Seems pretty quick to me, even with sqrt and arbitrarily large numbers. I called my version fib and your version fib2. I get: *Fib [ i | i - [30..100], fib i == fib2 i ] [32,35,43,46,51,71] Yes, the closed form is faster. But if, as part of the rules, one is allowed to give wrong answers, it's not difficult to write a function that's even faster than this. Cheers, Andrew Bromage ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Fibonacci numbers generator in Haskell
How about the closed form ;) -- fib x returns the x'th number in the fib sequence fib :: Integer - Integer fib x = let phi = ( 1 + sqrt 5 ) / 2 in truncate( ( 1 / sqrt 5 ) * ( phi ^ x - phi' ^ x ) ) Seems pretty quick to me, even with sqrt and arbitrarily large numbers. On 6/15/06 9:33 AM, Vladimir Portnykh [EMAIL PROTECTED] wrote: Fibonacci numbers implementations in Haskell one of the classical examples. An example I found is the following: fibs :: [Int] fibs = 0 : 1 : [ a + b | (a, b) - zip fibs (tail fibs)] To get the k-th number you do the following: Result = fibs !! k It is elegant but creates a list of all Fibonacci numbers less than k-th, and the code is not very readable :). I wrote my own Fibonacci numbers generator: fib :: Int - [Int] fib 0 = [0,0] fib 1 = [1,0] fib n = [sum prevFib, head prevFib] where a = fib (n - 1) To get the k-th number you do the following: result = head (fib k) It does not generate full list of Fibonacci numbers, but keeps only 2 previous numbers, and has only one recursive call. Because the list always has only 2 elements using the functions head and sum is a bit overkill. Can we do better? _ Are you using the latest version of MSN Messenger? Download MSN Messenger 7.5 today! http://join.msn.com/messenger/overview ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Editors for Haskell
With Haskell's lovely strong static typing, it is a crying shame we don't have an editor with immediate feedback, ala Eclipse. On 5/29/06 6:55 PM, Bjorn Bringert [EMAIL PROTECTED] wrote: Hi Chris, I followed your advice and tried SubEthaEdit. It seems to work really well, except that I can't figure out how to get it to indent my Haskell code correctly. What I expected was something like the Emacs Haskell mode where I can hit tab to cycle between the different reasonable indentations for a line. Am I right that SubEthaEdit does not have this feature? Or did I not RTFM enough? Maybe it's just me, but I find it difficult to write Haskell code without it. /Björn On May 25, 2006, at 8:10 AM, Christopher Brown wrote: Hi Walt, For Mac OS X I would strongly recommend using Sub Etha Edit. Its a very simple editor to use, and offers a lot of power and flexibility. It also has a Haskell highlighting mode. You can find it at: http://www.codingmonkeys.de/subethaedit/ Chris. On 25 May 2006, at 16:02, Walter Potter wrote: All, I hope that this is the right place for this question. I'm using Haskell (GHC and Hugs) on several different platforms. Windows, OS X and Linux systems. I'd like to have an IDE that works well for medium to large size projects. I know of Eclipse and hIDE. Vim works fine but I'd like more. hiDE seems to be in process. What would you suggest? I'll be asking my students to use the same IDE. Thanks, Walt ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
