So I've put together a small genetic algorithm simulation that I've
written in Java which I have recently ported to Clojure. While the
code looks sound from my perspective, yet I get the following
exception when I run my uberjar:
Exception in thread "main" java.lang.RuntimeException:
java.lang.ClassCastException: clojure.lang.Cons cannot be cast to
clojure.lang.Associative
at clojure.lang.LazySeq.sval(LazySeq.java:47)
at clojure.lang.LazySeq.seq(LazySeq.java:56)
at clojure.lang.RT.seq(RT.java:450)
at clojure.core$seq.invoke(core.clj:122)
at clojure.core$r.invoke(core.clj:793)
at clojure.core$into.invoke(core.clj:2615)
at net.auxesia.population$evolve.invoke(population.clj:87)
at net.auxesia.core$_main.doInvoke(core.clj:49)
at clojure.lang.RestFn.invoke(RestFn.java:398)
at clojure.lang.AFn.applyToHelper(AFn.java:159)
at clojure.lang.RestFn.applyTo(RestFn.java:133)
at net.auxesia.core.main(Unknown Source)
Caused by: java.lang.ClassCastException: clojure.lang.Cons cannot be
cast to clojure.lang.Associative
at clojure.lang.RT.assoc(RT.java:664)
at clojure.core$assoc.invoke(core.clj:170)
at net.auxesia.chromosome$mutate.invoke(chromosome.clj:58)
at net.auxesia.population$evolve
$r_mutate__29.invoke(population.clj:76)
at net.auxesia.population$evolve$fn__33.invoke(population.clj:
87)
at clojure.core$map$fn__3695.invoke(core.clj:2094)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
... 11 more
The source can be found at:
https://github.com/jsvazic/GAHelloWorld/tree/master/clojure
I've narrowed it down to the call:
(map #(r-mutate %) (chromosome/mate c1 c2))
which essentially takes two "chromosomes" and generates two new ones,
returning them in a vector. Each element of the vector is a map, and
the r-mutate function simply updates one of the KVPs for the given map
(randomly, depending on a threshold being hit), and returns a new
"chromosome". If the threshold isn't hit, it simply returns the same
chromosome it was provided. Any ideas from anyone?
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