Hi all,
I am new to the list and to Clojure. I have been working in
implementing some 2D cellular automata (CA) just to have a project
to teach Clojure to myself. After some work I have something that
works, but it is pretty slow. The function that takes a CA
of 500x500 cells (integers) and returns an updated (*) copy
takes 4 s. (using Clojure vectors), while doing more or less
the same in Java (using arrays and primitive types) takes more or
less 16 *ms.*. I expected some difference, but not that big. Before
trying to use Java arrays and primitive types
in Clojure, I would like to know how my Clojure approach can
be improved (I am willing to sacrifice some performance to keep
it "more Clojure", but not that much).
As I do not want to post a bunch of horrible code full of comments
and not properly indented, I have extracted what i hope are the
main pieces, written some comments and posted it here:
http://snipt.org/Okpk
Pasting that code in a new file in Eclipse (I am using
counterclockwise) and running it in the REPL prints this:
Clojure 1.1.0-alpha-SNAPSHOT
"Elapsed time: 4355.363706 msecs"
"Elapsed time: 4416.98562 msecs"
1:1 user=> #<Namespace cellular-automata-basic>
1:2 cellular-automata-basic=>
I would thank a lot any hint, suggestion, comment, or
whatever... :-)
Best regards,
Rubén
(*) The update consists on adding the values of the 8 neighbours
of every cell and changing it if that sum is between two fixed
numbers.
--
Rubén BÉJAR HERNÁNDEZ
Dpto. de Informática e Ingeniería de Sistemas - Universidad de Zaragoza
(Computing and Systems Engineering Department - Universidad de Zaragoza)
c/ María de Luna 1, 50018 Zaragoza, Spain
Tel: (+34) 976 76 2332 (Fax: 1914)
e-mail: rbe...@unizar.es
Grupo IA3 (IA3 Laboratory) - http://iaaa.cps.unizar.es
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