On Wed, 24 Dec 2003, Hal Daume III wrote: > one other thing you might find useful is to read it imperatively and then > use unsafeFreezeArray (i think that's the name) to get a pure array out of > it. since all you'll be doing is reading, this should work nicely for > you.
I must say, this sort of reply is EXTREMELY DISTURBING. It is ridiculous that one needs to get so intimate with implementation issues just to read a file! Is this inherent in Haskell or is it just that no one has bothered to create a the Haskell equivalent of BufferedReader? <http://java.sun.com/j2se/1.4.2/docs/api/java/io/BufferedReader.html> And if so, is there something about Haskell that makes a Haskell implementation of such a lib difficult? -Alex- _________________________________________________________________ S. Alexander Jacobson mailto:[EMAIL PROTECTED] tel:917-770-6565 http://alexjacobson.com > On Wed, 24 Dec 2003, andrew cooke wrote: > > > > > Thanks. I should have added that I will only use the array for reading > > once it's created. I don't mind whether creating is lazy or eager (it's > > currently eager because I was fighting a space leak, but I think that was > > down to some other error). > > > > I don't fully understand how either of the suggestions you make will speed > > up creation, though (I guess allocating less memory is faster). I'm > > looking for a factor of tens of thousands improvement. But I will try > > what you suggest. > > > > Cheers, > > Andrew > > > > PS Thanks for the very speedy reply and thanks to whoever maintains the > > list archive for updating the archive for each message (I'm pretty sure it > > used to be made daily, which was a nuisance if you wanted to forward URLs > > to interesting discussions). > > > > Hal Daume III said: > > > (1) use unboxed arrays, otherwise you're wasting too much space with > > > pointers. that is, unless you need laziness on the elements, which i > > > don't think you do based on your list > > > > > > (2) (maybe) use imperative arrays; this will help you ensure that > > > everything is being evaluated quickly. > > > > > > -- > Hal Daume III | [EMAIL PROTECTED] > "Arrest this man, he talks in maths." | www.isi.edu/~hdaume > > _______________________________________________ > Haskell mailing list > [EMAIL PROTECTED] > http://www.haskell.org/mailman/listinfo/haskell > _______________________________________________ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell