John Svazic <[email protected]> writes:
Snipping to the relevant portion of the exception (always look at the
last "Caused by"):
> Caused by: java.lang.ClassCastException: clojure.lang.Cons cannot be
> cast to clojure.lang.Associative
> at clojure.lang.RT.assoc(RT.java:664)
> at net.auxesia.chromosome$mutate.invoke(chromosome.clj:58)
So what that means is that a call to the "assoc" function on line 58 of
chromosome.clj is being passed a "Cons" object (a list cell) instead of
an "Associative" object (a vector or map).
The assoc call in question is this:
(let [old (:gene c)
idx (rand-int (count old))
new (assoc old idx (char (mod (+ (int (nth old idx))
(+ 32 (rand-int 90))) 122)))]
So "old" must be a list when you're expecting a vector. Looking around
at places you assign (:gene c) we come to the "mate" function,
specifically:
(let [...
child1 (into (drop pivot gene2) (reverse (take pivot gene1)))
child2 (into (drop pivot gene1) (reverse (take pivot gene2)))]
...
(hash-map :gene child1 :fitness (fitness child1))
...)
'drop is lazy so returns a seq, calling 'into on a seq produces a list.
So try calling vec on each child to convert it into a vector.
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