gildor changed the topic of #ocaml to: Discussions about the OCaml programming language | http://caml.inria.fr/ | OCaml 3.12.0 http://bit.ly/aNZBUp
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<accel> does ocaml compile to the ipad ?
<adrien> I think it should since it does for the iphone, needs you to take additional steps however
<rwmjones> I got the impression they were cross-compiling for iphone?
<accel> cross compiling is fine
<accel> I don't need it to run on the ipad
<accel> I just need to be able to code in ocaml
<adrien> there was something else and I think you were able to code in ocaml directly on the ipad
<adrien> not so long ago
<adrien> "[Caml-list] Type Safety comes to the iPad"
<adrien> What I have done is ported the interpreter ocamlrun
<adrien> to the iPad and added a gui based on Graphics.cma and bound ancillary libraries such as Num.cma
<adrien> into the executable. The ocaml interpreter itself is written in ocaml and is identical to the workstation
<adrien> version of the same release.
<adrien> rargh, sorry for the paste-fail =/
<accel> nice; thanks :-)
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<albacker> is there a NULL char in ocaml?
<rwmjones> what is a "NULL char"?
<rwmjones> you mean ASCII NUL, that is '\000'
<flux> it doesn't of course terminate strings or anything such silly things
<flux> ..except when you use them in certain contexts, such as when calling operator system calls that assume \000 terminates something
<flux> such as opening a file
<flux> that hasn't been fixed, has it?
<flux> (throwing Invalid_argument when \0 detected in an argument to open_file would be fixing in my book)
<albacker> i wanted something that wouldn't be found in a 'norma' .txt file to start an array with.
<albacker> normal*
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<albacker> but i found another solution, and thanks rwmjones flux :)
<albacker> flux: you have written a book?
<flux> nope
<flux> well, I wrote my thesis and it was bind as a book, so I guess yes.. ;)
<albacker> cool :)
<albacker> can a fun tell me if there's x present in the list L, and if yes return x, otherwise return false (or something like this). Should i use None, Some?
<adrien> List.mem?
<albacker> because using List.exists and then iterating throught the list a 2nd time, seems not intelligent.
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<albacker> Hell yeah.
<albacker> thanks
<adrien> =)
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<kerneis> albacker: if you want to return x, then you'd rather use List.find
<kerneis> (and catch the exception it's not there)
<adrien> argh, right, hadn't read correctly /o\ 
<albacker> kerneis: i see, thanks.
<albacker> adrien: i'm sorry, kerneis wins :p
<adrien> ;-)
<adrien> it's ok, I can blame it on pkgconfig, windows and the fact that I'm having lunch at 4:30pm
<albacker> ha!
<albacker> i had to que 45 minutes to eat lunch (Student resto)
<albacker> 42 minutes to be exact.
<adrien> and 3 minutes to eat?
<albacker> 4.2 to eat.
<albacker> it takes more time queuing than eating, that's for sure.
<albacker> unless you go there first, (11:30am).
<albacker> but that means that around 4:30pm, i'll be hungry again.
<adrien> yeah, student restaurants always get crowded pretty suddently
<adrien> hmmm, I'm using the native backtraces, there's no way to get arguments to functions printed I guess
<albacker> can someone explain me this : http://pastebin.com/GbN9FrfP
<adrien> albacker: that mylist remains unchanged?
<albacker> adrien: yes.
<kerneis> adrien: you build a *new* reference
<albacker> List.find doesn't return _the_ list entry?
<kerneis> albacker: sorry
<kerneis> as a matter of fact, what you want is:
<kerneis> let mylist = [ref ('a',1); ref ('b',2)];
<kerneis> let ch = List.find (fun x->(fst !x)='a') mylist;;
<kerneis> each time you use "ref", you have a new reference with no relationship with the old one
<albacker> and if i ever want to add new entries to mylist i'll have to add a ref before the [ ] no ?
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<adrien> depends on how you code: if you want to update your list, you'll have to but typically, in ocaml, you'd simply build a new list with 'your_new_element :: your_list' (it'll share everything, it's a very lightweight operation)
<adrien> really depends on what you want and how you're doing things
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<albacker> thanks.
<albacker> this is what i was trying to do http://pastebin.com/Z6xpQYAS by going throught the list/string the less possible.
<adrien> you can use str.[i] to access the i-th element of a string btw
<albacker> theres a small error on line12, [ ] shouldnt be there.
<adrien> ah, you want to count the number of occurences of a character
<albacker> adrien: :)
<albacker> i was thinking on how to have a small complexity of the function.
<albacker> i think i have O(n^2) now.
<adrien> why not use an array to store the frequencies?
<albacker> i dont know the number of different characters in advance.
<adrien> you know the maximum number of characters: 256
<albacker> true
<albacker> i started with an array (null char question i asked above)
<adrien> why were you trying to "start" an array with? or were you thinking about using a "(char*int) array ref" and recreate an area for each new character?
<albacker> well i was thinking about creating the array at the beggining like let freqs = array.make 256 ('_', 0)
<albacker> in place of '_' have a null char or smth.
<albacker> but since there's 0, i don't even need a null char.
<adrien> Char.code / Char.chr and use the index of the element in the array to find the corresponding character
<adrien> so you'd use an 'int array'
<adrien> arr.[Char.code 'a'] <- arr.[Char.code 'a'] + 1;
<albacker> is Char.code same as int_of_char ?
<adrien> seems so :-)
<albacker> adrien: http://pastebin.com/z4r0cEiN :)
<albacker> i couldnt remplace the line 10 by ch <- ....
<albacker> Unbound instance variable.
<adrien> well, it's working here, but what about http://pastebin.com/8LhytYVZ ?
<adrien> and I made a mistake: I should have used ( and ) instead of [ and ] ten minutes ago
<albacker> yes you're right, i dont need the extra char.
<albacker> even though the only problem of using the array is chars like 'ç'
<adrien> why? ;-)
<albacker> is that ascii?
<albacker> i mean unicode chars for example.
<adrien> nope but it's ok in iso8859-1(5)
<adrien> you won't get unicode with String anyway
<albacker> OK
<adrien> you can get unicode however, but not with the base ocaml runtime (camomille)
<albacker> ok thanks for clarifying.
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<hcarty> Does Batteries have a string_printer-like function which does not quote strings? I'm looking for an equivalent to "let str_printer tuple out s = IO.nwrite out s"
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<rikta06> How to create a directory in ocaml ?
<adrien> rikta06: Unix.mkdir
<adrien> rikta06: if you're going to work with files a lot, you might want to look at ocaml-fileutils
<rikta06> oh, on which OSs does this work ?
<adrien> everywhere
<adrien> I use ocaml-fileutils on windows and unix actually
<rikta06> Oh, nice, thanks for the pointer.
<adrien> thanks gildor for the library :P
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