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<joko> Hello, I'm interested in implementing a best first search algorithm in OCaml, do you have any tips?
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<flux> joko, just do it :)
<thelema> joko: not really - I have a maxarg function that might be useful for you
<flux> I guess he eventually need the remaining values as well
<thelema> oops, yes... I guess sorting is best...
<flux> or possibly a map
<flux> I'm not sure if that's the same algorithm still
<flux> and you need batterie's variation of it as well, so you can find the lower/highest score element :)
<thelema> BatArray.decorate_fast_sort, if your cost fuction is expensive
<flux> (or use a Set one keeps in synch)
<thelema> joko: what data structure are you going to use for your graph?
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<adrien> with batteries, I'm trying to read two files and find the matches for the first file in the second file, so far I'm using BatEnum, my issue is that find consumes the enumeration while searching and I don't know if the input files are sorted and I don't see a way to sort enums directly
<adrien> is the only way to convert to an array or list?
<hcarty> adrien: Would a map or hash table work?
<hcarty> Or a set
<hcarty> Inset all elements from (1) in to the set, them check each element from (2) against the set
<adrien> hcarty: yeah, of course, I started this the stupid way , I/O will be limitating anyway
<adrien> hmmm, I was told they are actually sorted (I'm helping a biology student, for me it's the occasion to learn Batteries, for her it's the occasion not to write horrible perl :p )
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<adrien> why is a functor required to make a hashtable with a custom hash btw?
<adrien> I can't see a big problem but I can see smaller ones (especially when marshalling)
<flux> aren't non-functored approaches especially difficult when marshalling? you need to marshal closures as well?
<flux> although I'm not sure if there is a good reason.. Hashtbl doesn't have functions that interface with more than one Hashtbl at the same time.
<adrien> and BatList.find should have a special case for sorted lists (it'd consume only up to a point: it'd stop when the sorting makes it impossible to find new values)
<flux> how often would that be used?
<adrien> at least once :P
<flux> when one hears about sorted lists, using another data structure comes to mind..
<adrien> sorted lists would make it O(n) actually, it'd be good
<adrien> (and I'm just too tired for anything tonight, better eat, go to bed and do that tomorrow=
<adrien> )
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<flux> ..versus using non-sorted lists with O(n) complexity?
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<edwin> hi
<edwin> speaking of marshaling, what are safe alternatives? (that don't crash when marshaled data is corrupted)
<edwin> I think SQL DB is one, anything else?
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<adrien> flux: no, I'd be consuming two enums, not one, the non-sorted case would be much worse
<adrien> edwin: binprot, biniou/json, sexplib
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<edwin> adrien: thanks, I'll have a look at those
<adrien> there are more too
<redfire> hi
<redfire> I would like to compile one ocaml file with the lib bitstring (yes I'm sill on it :-)) and I'm not used to ocaml compilation
<redfire> In the documentation we can see, an example but not juste to get a .cmo
<redfire> Anyone knows how to do that ?
<adrien> ocamlfind ocamlopt -package bitstring -linkpkg yourfile.ml
<adrien> or "ocamlc" instead of "ocamlopt" for bytecode
<adrien> add -c to get only the .cmo / .cmx file (only compilation as opposed to compile + link)
<redfire> and if the library is installed in lib/bitstring
<adrien> and that is assuming you have ocamlfind/findlib which you should definitely install if you don't already have it
<redfire> yes I already have them
<redfire> I get a syntax error with your command on a line using bitstring matching
<redfire> In fact all bitstring stuff (.cmo etc.) are in lib/bitstring
<redfire> and I don't know how to make the link by using this directory instead of /usr/lib/...
<adrien> try with: -package bitstring,bitstring.syntax
<redfire> thanks this one works
<redfire> but now I want to use the bitstring of my directory lib/
<redfire> and not the one of th system
<redfire> is it possible N
<redfire> ?
<adrien> first, why, and then, how have you installed this bitstring?
<adrien> specifically, do you have a META file in your lib/
<adrien> there's also the dead-simple solution: run the previous command with -verbose, copy paste the output (it lists the commands being run) and update the paths
<redfire> why ? school project.... So I have to put everything together
<adrien> ok
<adrien> does that mean you'll have to compile bitstring on the host machine?
<redfire> probably
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<Messanger> world leaders setting you all up right now to get microchipped by RFID microchips with identity/healthcare/credit information into their new world order why they are folding the economy , their solution to the problem they are causing is the RFID microchip http://www.scribd.com/doc/44997148/The-Mark-of-the-Beast Romans 10:13 all who call upon the name of the Lord shall be saved.
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* adrien wonders if that bible quote was required
<adrien> (actually I'm wondering why it was put there, can't see the link)
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<metropolis> Ok, is it possible to build C-callable libraries using ocaml?
<metropolis> My startup is evaluating ocaml, which a few people have played with, as our "performance" language for writing performance-critical sections of our codebase, and then ultimately calling from our extensive python codebase. So the first question is "can we create shared objects that something-that-needs-a-C-API-can-call?"
<adrien> as far as I know, yes, but I've never done it
<adrien> (won't allow you to get thread-level parallelism however)
<rwmjones> metropolis: yes, it's quite tricky though
<rwmjones> you will still need to write manual wrappers around the libraries (we were hoping to autogenerate those but didn't get around to it)
<rwmjones> and take care with parallelism
<adrien> http://www.linux-nantes.org/~fmonnier/ocaml/ocaml-wrapping-c.php#ref_bootfromc and the link to the manual at the end of the section
<metropolis> My understanding was that the current ocaml runtime did not support thread-level parallelism, is that correct?
<metropolis> Well, my christmas project might be tackling this, because we rely on boost::python to wrap c++ in python right now, and it's pretty easy to use, but sweet zombie jesus I want to get us away from c++
<metropolis> adrien: that link helps a lot, thanks
<adrien> only one ocaml thread may run at a given time with the current implementation, a project called oc4mc is working on improving that
<metropolis> this is a dumb question, but are there IPC mechanisms to make message-passing concurrency from multiple processes viable?
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<adrien> there's a number of different libs/approaches depending on your needs, I'm only familiar with ocamlnet (it has rpc but it's type-safe and pretty easy to use, but it also has some modules for shared-memory and passing values between caml processed), it's probably not the easiest library however
<adrien> I need to go to sleep, it's getting hard to make sense :P
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<hcarty> metropolis: There are also JoCaml, camlp3l and ocamlmpi as options for message passing/multi-processing
<metropolis> hcarty: thanks!
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<hcarty> metropolis: Good luck on your quest to escape C++ :-)
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