John Svazic <jsva...@gmail.com> 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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