smimou changed the topic of #ocaml to: OCaml 3.08.3 available! | Archive of Caml Weekly News: http://sardes.inrialpes.fr/~aschmitt/cwn/ | A free book: http://cristal.inria.fr/~remy/cours/appsem/ | Mailing List: http://caml.inria.fr/bin/wilma/caml-list/ | Cookbook: http://pleac.sourceforge.net/
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<kinners> looks like gcaml has been updated...
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<bubba123> I am trying to compile camlffi and I keep getting link errors. The main one "undefined reference to __errno".
<Submarine> sounds like thread issues on some systems
<bubba123> I've gotten other things to compile OK, but I think it is some weird thing with the makefile.
<bubba123> I don't think it's threading because I can't imagine ocamlffi using threads.
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<mflux> I wonder where kinners had seen that gcaml was updated
<mflux> also I wonder2 if gcaml would be the way to binary compatibility in ?caml
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<Msandin> I wonder if I should release Tywith 0.45 including 'parser_<type>' support now? It might help make it useful to someone...
<Msandin> Done.
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<bubba123> I am trying to compile camlffi and I keep getting link errors. The main one "undefined reference to __errno".
<mflux> maybe you should try a mailing list
<mflux> it does sound like a platform problem though
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<vincenz> I have a problem with the complexity of an algorithm
<Smerdyakov> Use a simpler algorithm.
<Smerdyakov> NEXT.
<vincenz> it is simple
<vincenz> I meant time complexity
<mflux> use simpler time maybe?
<vincenz> I guess posting it for advice isn't worth my time
<mflux> it could
<vincenz> Not with such negative attitudes
<mflux> what kind of algorithm is it? (in general terms)
<mflux> ;(
<vincenz> I'm trying to cluster symbols to get a higher level view of the behaviour of a stream of such symbols
<vincenz> cluster them timewise that is
<mflux> you mentioned a pattern detection task earlier, this must be it
<vincenz> for instance.... a a b a a b -> 2*(2*a b)
<vincenz> yes
<vincenz> however my algorithm is O(N^2)
<vincenz> It's been running for over 12 hours now and it's only past 19M symbols
<vincenz> this file has 50M
<mflux> I suppose getting N^2 cpu's isn't an option
<vincenz> hehe
<vincenz> wouldn't help much, it's not very parallelisable
<Smerdyakov> Do you have machine learning people at your location?
<vincenz> What specifically are you thinking of?
<Smerdyakov> Asking them how they would solve this problem.
<mflux> I think some years ago I too was investigating such an algorithm, but it was atleast N^2 too
<vincenz> I guess I could try using lempelziv but the problem with lempelziv is the chaos it has in a startup of a sequence
<mflux> and I don't even remember if it worked ;)
<vincenz> Smerdyakov: yes but something must've made you say "lempel ziv"
<vincenz> ugh
<vincenz> machine learning I mean
<Smerdyakov> Yes. "Clustering" is one of the general activities undertaken by machine learning people.
<mflux> would a b a a b a a b be encoded as a b 2*(2*a b) ?
<mflux> or maybe as sym_ab 2*(a sym_ab)
<vincenz> I think the first solution is good enough
<Smerdyakov> Put another way, your problem clearly falls within the domain of "machine learning." That's why I recomend asking them.
<mflux> well the latter I would think to be too difficult to get faster than N^2, but maybe with that limited problem it becomes possible
<vincenz> The problem is that for each symbol I must run back into the stream to find matching symbols and then match the "prefix" I cut off with the prefix further in the stream
<_fab> hhm
<_fab> i read an article about burrows wheeler transformation, it could make this kind of search very fast
<pango> _fab: what's being used by bzip2 ? I'm not sure of the name
<_fab> pango: yes, that is this transformation
<_fab> the article was from c't about a fast indexing structure
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<bubba123> I am trying to compile camlffi and I keep getting link errors. The main one "undefined reference to __errno".
<TeXitoi> bubba123: the more important is the first one, not the "main" one
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<bubba123> It is the first one, iot also get it the most.
<TeXitoi> what is the compil line and the first error line?
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<TeXitoi> bubba123: if you can copy your compil log on a pastebin, that would be easyer to help you (http://pastebin.ca/)
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<TeXitoi> it smells very unix specific...
<pango> you probably mean Win32 specific... See -D__MINGW32__
<TeXitoi> pango: a unix specific program that don't compiles on win23, I mean ;-)
<TeXitoi> s/win23/win32/
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