2010/8/17 jandot <jan.ae...@gmail.com>: > Hi all, > > I'm trying to write a library to perform some statistical and data > mining analyses. Clojure has proven a great help here, especially with > the incanter library. Writing the code has been kind of an "organic" > process (read: no planning), and I ended up with different conceptual > groups of functions all within one file. So it makes sense to split > this up and start organizing it. > > Unfortunately, I am having trouble making the different files (and > namespaces) talk to each other, and need some help. > > Let's say I have two parts in my analysis, each of which require quite > a few underlying functions. I would ideally start up a repl and focus > on just one analysis: playing with the data, making some graphs, ... > > I've created a leiningen project with "lein new my-important-project", > to which I added two files in src: analysis-1.clj and analysis-2.clj. > Directory structure: > > +- project.clj > +- test > | +- my-important-project > | +- core.clj > +- src > +- my-important-project > +- core.clj > +- analysis-1.clj > +- analysis-2.clj > > Let's say this is the contents for those 3 files in src/ (core.clj > contains functions and constants that are necessary for both > analyses): > > ==== core.clj ==== > (ns my-important-project.core > (:use [incanter core io stats charts] > [somnium congomongo])) > (mongo! :db "the-database") > (def some-constant 3.141592) > > ====analysis-1.clj==== > (ns my-important-project.analysis-1) > (defn say-from-one [text] (println (str "from 1: " text))) > > ====analysis-2.clj==== > (ns my-important-project.analysis-2) > (defn say-from-two [text] (println (str "from 2: " text)))
Here, the ns declaration looks right. > If I want to work on analysis 2, I'd start up the repl in the main > directory created by lein (so one *up* from src) and type: > > user=> (ns '(my-important-project core analysis-2)) > user=> (say-from-two "some text") ns is a macro normally used at the top of the source files. To force the code of a namespace/file to be loaded, call require (which, unlike ns, is a function and thus requires the args to be quoted): (require '(my-important-project core analysis-2)) At this point, you should be able to call say-from-to with its full name: my-important-project.analysis-2/say-from-two. You can use the :as option to make a shorter prefix if you like (see link below). If you want to play around inside the namespace, you can go into it by calling: (in-ns 'my-important-project.analysis-2) or simply use the ns macro: (ns my-important-project.analysis-2) You will see the prompt change when you do this and from here you should be able to call say-from-two directly. > But as you'd have guessed: this doesn't work. The (ns) returns the > following error: > java.lang.ClassCastException: java.lang.String cannot be cast to > clojure.lang.IObj (core.clj:1) > > I've tried different versions of the (ns) function, including a vector > as its argument, periods instead of spaces, ... > > In addition: in the end I'd like to write a script that does the > analysis automatically. So instead of going into the repl, I'd "cljr > run" a clj file. What should the (ns) bit of that file look like? > > I've been searching the web for what I'm doing wrong, but haven't > found the solution yet. It's quite frustrating to see so many > discussions about namespaces, but not being able to solve this issue. The ns macro and library conventions are described here: http://clojure.org/libs > Any help very much appreciated, > jan. The ns macro is pretty complex and unfortunately I don't have time to write longer about it right now. I hope this could at least get you started. // Rasmus -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
