gildor changed the topic of #ocaml to: Discussions about the OCaml programming language | http://caml.inria.fr/ | OCaml 3.12.1 http://bit.ly/nNVIVH
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<thelema> astory: 2-sat? You don't need a library - the algorithm is pretty trivial, and the work of converting your data structure to the form for the library would be the same as the work of solving 2-sat
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<smango> I can't figure out why ocaml is complaining "Unbound module Thread", I'm doing "open Thread" at the top
<thelema> smango: you have to link with the thread runtime: ocamlc -thread
<smango> oh sorry, what if I'm trying to load it in the toplevel with #use?
<thelema> if you are using findlib, it has #threads, iirc
<thelema> nope, #thread
<thelema> There's probably a way to do it without findlib (#use "topfind"), but I don't know it.
<smango> it doesn't seem to know what topfind is, is there soemething I have to install?
<thelema> topfind is part of findlib, which also provides ocamlfind
<smango> awesome, thanks
<thelema> if you're not using findlib, you should be.
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<merijn> Are there any functions to reverse strings/turn string into char lists that I'm somehow overlooking, or don't these exist in the stdlib?
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<f[x]> String.explode
<f[x]> in extlib
<merijn> f[x]: Thanks
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<reynir> Hello!
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<f[x]> gildor, ping
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<gildor> f[x]: pong
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<f[x]> with current oasis ocamlbuild file.pp.ml doesn't work
<f[x]> I am fixing it
<f[x]> but I need to get the list of all ocamlfind packages used in current project
<f[x]> is there an easy way?
<f[x]> all ocamlfind packages installed on the machine is no good cause I need to run ocamlfind query on each of them
<f[x]> and it will be too much overhead
<f[x]> in parallel I will need to patch ocamlfind to run camlp4o directly with usual handling of -package options
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<f[x]> but having this working with current ocamlfind is also needed
<gildor> f[x]: you need to it from setup.ml or myocamlbuild.ml ?
<f[x]> myocamlbuild
<gildor> humm
<f[x]> aha, maybe just adding some field to setup.data?
<gildor> you should write something that dumps the package in setup.ml into a variable in setup.data and read it from myocamlbuild
<gildor> f[x]: indee
<f[x]> so, recursively, how to get the list of all ocamlfind packages in setup.ml? :)
<gildor> List.fold (fun _ _ -> function | Library (_, bs, _) | Exec (_, bs, _) -> merge bs.bs_build_depends)
<gildor> on pkg.sections
<f[x]> ok!
<f[x]> thanks
<gildor> and filter bs.bs_build_depends on FindlibPackage _ (you are not interested in InternalLibraries)
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<gildor> f[x]: BTW, I am preparing upcoming oasis 0.2.1, hope to release next week, if you have bugs tell me now (on the BTS)
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<thelema> gildor: when using quickstart, which plugins should I use for a trivial library that depends on batteries?
<thelema> (oasis quickstart)
<graph012> try to install ocamlgraph but it doesnt find graph.cmxa
<thelema> graph012: have you built graph.cmxa?
<thelema> graph012: try `make opt`
<graph012> instead of make install?
<thelema> graph012: before make install
<gildor> thelema: I use DevFiles, META
<thelema> gildor: ok, thanks
<gildor> DevFiles -> create Makefile + configure and META create src/META
<thelema> gildor: ah, that helps a *lot*.
<thelema> what's StdFiles?
<gildor> AUTHORS.txt, README.txt and INSTALL.txt (AFAIR)
<thelema> you're right.
<thelema> I just found the section in the manual
<gildor> e.g. INSTALL.txt will list the dependencies you need to install
<gildor> for example if you use batteries (>= 1.0.0), it will write in INSTALL.txt that batteries (>= 1.0.0) is needed
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<graph012> thelema: made make opt in the ocamlgraph folder, but i get an Assembler error in the file "src/delauny.ml"
<thelema> graph012: what platform are you compiling on?
<graph012> ubuntu 11.10
<thelema> ocaml version?
<graph012> 3.12.0
<thelema> any chance you can upgrade to 3.12.1?
<thelema> That's what I'm using, and it compiles ocamlgraph-1.7 just fine under my ubuntu 11.10
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<graph012> thelema: how can i remove the ubuntu ocaml, before i compile 3.12.1?
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<thelema> remove the ocaml-base package and everything that depends on it
<thelema> err, ocaml, ocaml-base and ocaml-base-nox
<thelema> that should suffice
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<thelema> My adaptation of the ideas (and much of the implementation) of criterion is now available as `bench` on odb and https://github.com/thelema/bench
<thelema> (also my first real oasis package)
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<graph012> thelema: i just compiled the ocaml-3.12.1 but when i enter ocaml into the command line it says not installed
<Qrntzz> graph012: possibly a silly question, but did you `sudo make install`?
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<graph012> Qrntzz: i did sudo make install, had to set the Path manually now ocaml works fine, the problem now is that ./configure in the findlib doesnt find m4
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<graph012> where do i get this m4?
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<thelema> graph012: the package name is simply `m4`
<graph012> thelema: configure: m4 not in PATH; how can i fix this?
<thelema> `sudo apt-get install m4`
<graph012> thelema: is it better to do make all or make opt?
<thelema> `make all` should be equivalent to `make byte opt`
<thelema> so `make all` is better, unless you really don't want bytecode executables/libraries
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<graph012> thelema: if i try to install ocamlgraph it tells me /bin/sh: ocamlfind: not found, but which ocamlfind tells me /opt/ocaml-3.12.1/bin/ocamlfin
<graph012> d
<thelema> graph012: sounds like a path problem with your shell - I'm not sure how to solve it. brute force (logging out and then back in) will usually work
<graph012> thelema: i ll try
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<graph> thelema: still not working
<_habnabit> how can I tell ocamlfind ocamlopt to show me what other commands it's invoking?
<_habnabit> trying to figure out what options it's passing to the linker
<thelema> _habnabit: ocamlfind ocamlopt -verbose ...
<_habnabit> ah
<thelema> graph: did you put anything in your ~/.bashrc to add ocaml to the path?
<_habnabit> great, thanks
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<_habnabit> okay well before I do a bunch of dumb things, here's what I'm trying to do: via ocamlbuild/ocamlopt, pass some extra object files to the linker
<_habnabit> but I'm not sure if there's an ocamlbuild command or flag or whatever for that, or if I should just do flag with -ccopt x.o
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<graph> thelema: yes
<thelema> using `export`?
<graph> thelema: yes
<thelema> _habnabit: ocamlfind ocamlopt -verbose ...I guess you could try running the command that fails within make at your command prompt
<_habnabit> thelema, hm? nothing's failing
<thelema> sorry, mixed messages up
<thelema> graph: I guess you could try running the command that fails within make at your command prompt
<thelema> _habnabit: ocamlbuild has -lflag that should add to linking flags.
<_habnabit> oh, I guess I forgot to specify: I mean from within myocamlbuild
<graph> thelema: how?
<thelema> _habnabit: another way is to put some code in your myocamlbuild.ml with the "link" tag
<_habnabit> ah
<thelema> graph: make tells you the command that's failing - copy and paste it to the command line
<graph> thelema: /bin/sh: ocamlfind: not found make: *** [install-findlib] Error 127
<thelema> _habnabit: within myocamlbuild, `flag ["ocaml";"link"; "special-lib"] & S[A"-lspecial-lib"]`
<thelema> graph: what's the command?
<_habnabit> ah okay
<graph> thelema: make install-findlib
<thelema> yes, that's the make command, what's the ocamlfind command that's failing?
<graph> thelema: ocamlfind install ocamlgraph META \ src/*.mli view_graph/*.mli dgraph/*.mli \ graph.a graph.cmx graph.cmo graph.cmi graph.cma graph.cmxa
<thelema> graph: and when you run that at the command line...?
<graph> thelema: sudo: ocamlfind: command not found
<thelema> ah, yes. of course ocamlfind isn't in root's path
<thelema> give the full path to ocamlfind and it'll work
<thelema> or add ocamlfind's binary to root's path
<graph> thelema: how to?
<thelema> how to add to root's path? edit root's .bashrc
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<graph> thelema: export PATH=/opt/ocaml-3.12.1/bin:$PATH
<graph> this is already there?
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<thelema> you put that in /root/.bashrc ?
<graph> thelema: in home/.bashrc
<thelema> for it to apply under sudo, it needs to be in /root/.bashrc (the superuser's bash config file, not your user's bash config)
<thelema> the easier solution is probably to just run `/opt/ocaml-3.12.1/bin/ocamlfind install ocamlgraph META ...`
<graph> thelema: i changed it in the root/.bashrc but it still doesnt work
<_habnabit> hmm, is there a way in myocamlbuild to /remove/ flags specified by other things?
<_habnabit> trying to fix static linking on OS X, which is turning into kind of a pain
<thelema> TAGS.Operators.--?
<thelema> err, Tags
<_habnabit> ah, finally found the full API ref for ocamlbuild
<flux> what? that exists?
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<Drakken> Does anyone know if there's a way to display more than one plot window at a time using plplot?
<graph> thelema: thaaaaaaaaaaaaanks it finally works
<thelema> graph: you're welcome.
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<thelema> Drakken: I don't. are you working on batbench?
<Drakken> thelema i've been looking for a plotting library, but for some inexplicable reason they all seem to support only one global plot at a time.
<thelema> probably simplest to support. You're trying to do something like ggplot2's facets?
<Drakken> Has no one in the sci-plot business hear of oop?
<Drakken> I just thought it would be natural to wrap the plot in an object.
<_habnabit> hmm. how do libraries like ocaml-gsl specify flags like -lgsl? -lgsl is coming from /somewhere/ but I can't find it
<thelema> Drakken: it is; just it's not possible to combine multiple plot objects into a single image, I guess.
<_habnabit> it's not in the META
<thelema> _habnabit: ah, that's magically done in the .cmx, iirc
<_habnabit> 'in' it how?
<_habnabit> brb, restarting
<thelema> the ocaml compiler remembers what C libraries need to be linked with a ocaml module
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<thelema> _habnabit: "From the file x.ml, the ocamlopt compiler produces two files: x.o, containing native object code, and x.cmx, containing extra information for linking and optimization of the clients of the unit."
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<Linus_> Good evening!
<Linus_> I'm trying to write a function that will return the first n elements of a list
<Linus_> so far I have:
<Linus_> let rec take n list = match list with [] -> [] |h::t -> if n>0 then h::(take n-1 list) else [];;
<thelema> you need () around n-1
<Linus_> ooh, thanks! :)
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<thelema> otherwise you're passing 4 arguments to the take function: n, (-), 1, list
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<Linus_> Yeah, that did it !
<Linus_> thanks
<thelema> n/p, I've made this mistake many times, and the compiler error isn't so obvious
<Drakken> So what software do we usually use to display plots?
<Linus_> haha, that's for sure
<thelema> Drakken: I've been doing most of my plotting lately with R. Its ggplot2 package does support the thing you want to do.
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<Drakken> thelema I wasn't even thinking of anything that fancy. I just thought the code would look like let plot1 = Plot.create_plot(...); plot2 = Plot.create_plot(...) instead of just Plot.create_plot(...).
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<Drakken> I mean let plot2 = ...
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<_habnabit> thelema, aha
<thelema> in order to store a plot in a variable, one must have an ORM-like representation of the plot, which requires a "grammar of graphics". ggplot2 is the only library I know of that is built in this way.
<Drakken> And for the last one I mean Plot.init(); Plot.draw(...)
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<thelema> bbl
<Drakken> Why aren't they *all* built that way? How many people know they'll *never* want to compare two or more plots against each other on the screen?
<yezariaely> has anyone of you tried ocaml + qt (https://github.com/Kakadu/lablqt) ?
<yezariaely> is it worth a look? does it work?
<flux> meh, janet street core doesn't install in my debian unstable, nor does it compile, and lablqt depends on that
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<yezariaely> flux: this is created from the guys of jane street ?
<flux> no
<yezariaely> ah only dependency opk
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<flux> meh2, there is a 150 days old bug on libcore-ocaml-dev not being installable on debian unstable, and there's been 0 reaction to that
<flux> and of course in the meanwhile the library source of debian libcore has gone rotten, so it won't anymore even build against the latest other libraries
<flux> I guess I need to give in and not use packaging for that :)
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<Drakken> thelema what did you have in mind for the batbench plot(s)?
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<thelema> drat, just missed drakken
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<thelema> well, looks like I wouldn't have got him with a message at the beginning of looking for bench plots
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<Drakken> thelema I'm still here.
<thelema> oh.
<thelema> The density plots on this page are the next step for bench - computing KDEs for the sample data.
<thelema> I've not worked out how to convert the sample data to a Kernel Density Estimate yet, so we can't do this at the moment
<thelema> I'm looking for an example of the other plots that criterion does - just a simple bar chart with x axis = 1..n and y values = the time of run n
<thelema> http://www.serpentine.com/blog/2009/09/29/criterion-a-new-benchmarking-library-for-haskell/ <- this page used to have pictures of the raw timing info, but they're 404ing at the moment
<Drakken> you mean the output of run_benchmark?
<thelema> run_and_analyze returns the timings too, as part of a `results` record
<thelema> so this would go in between `run_and_analyze` and `summarize` in `bench` and `bench_n`
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<thelema> I have a commented out field in the config record that is intended to hold output functions
<thelema> CSV and JSON would be possible outputs, PNG another output for timings, also eventually PNG for KDE, and the current text output with summary another output
<thelema> Drakken: will it interfere with what you're doing for me to reorganize some of the bench code to put in a simple output structure defaulting to [summarize]?
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<thelema> Drakken: http://donsbot.wordpress.com/2010/02/23/modern-benchmarking-in-haskell/ <- Page 4 of this presentation
<thelema> That's the bar plot I was thinking of, although if each bar was just a single pixel wide, maybe with a little ball at the top, it wouldn't be too bad.
<Drakken> So the local variable samples in analyze_samples is an array of runtimes and the samples field in config is an integer.
<thelema> the samples field in config is an integer indicating the number of samples to perform
<Drakken> i.e. the length of the array
<thelema> the variable samples in analyze_samples is an array of runtimes.
<thelema> yes
<thelema> although the `analyze_sample` code doesn't have access to config.samples, it just uses Array.length to get the number of samples
<Drakken> So you don't want to pop the plot up onto the screen?
<thelema> output to a file seems most useful to me; outputting to the screen is fine, but doesn't allow pretty blog posts. :)
<thelema> also, screen output implies the need for some UI - at least a quit on <ESC> or <CR>
<thelema> what do you think?
<Drakken> How do you display CSV or JSON as plots?
<thelema> those are text output, not as plots
<thelema> text output to a file
<thelema> so also on the todo list is main() function for bench that handles command-line arguments that instruct what output to produce
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<thelema> (and to adjust each of the other config parameters)
<thelema> If you're interested in this, I can recommend a good library for handling command-line arguments
<Drakken> go ahead and reorganize.
<thelema> ok. are you using https://github.com/thelema/bench ?
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<Drakken> yes
<thelema> great. how comfortable are you with git / github?
<Drakken> I'm clueless nooob
<Drakken> *a* clueless
<thelema> no worries. Try cloning the repository and checking out your clone.
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<Drakken> Do you have any specific plotting software in mind?
<thelema> nope, whatever is easiest / most useful for you. Plplot is good, also archimedes. I've never used either.
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<Drakken> What continent are you on?
<Drakken> i.e. timezone/hours
<thelema> US, EDT
<Drakken> okey doke. I'm US Central.
<Drakken> So for now we're just outputting runtimes to some file format that can be blogged.
<Drakken> as a bar chart
<thelema> yes, we want to plot runtimes to a png file as a barchart
<thelema> input is array of runtimes, a filename, and maybe x,y sizes in pixels
<Drakken> Okay. I'll get cracking on it.
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<thelema> start with being able to plot [|20.; 23.; 18.; 21.|] to "output.png" at 300x400
<thelema> i.e. I want to be able to call `barplot 300 400 "output.png" [|20.; 23.; 18.; 21.|]` and have your code just run
<thelema> That's your test case.
<thelema> (not that I'm a huge fan of TDD)
<Drakken> I practice BDD: code until you find a bug, then write a test for it :)
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