Data update

Task/Evolutionary-algorithm/Icon/evolutionary-algorithm-2.icon

@@ -0,0 +1,7 @@
+(var c 100)  ;number of children in each generation
+(var p 0.05) ;mutation probability
+
+(var target "METHINKS IT IS LIKE A WEASEL")
+(var tsize (len target))
+
+(var alphabet (to-vec " ABCDEFGHIJLKLMNOPQRSTUVWXYZ"))

Task/Evolutionary-algorithm/Icon/evolutionary-algorithm-3.icon

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+(var fitness (comp @(map = target) (count val)))
+(var perfect-fit? (comp fitness (= tsize)))
+
+(var rand-char #(rand-pick alphabet))
+(var mutate (map #(if (< (rand) p) (rand-char) %)))

Task/Evolutionary-algorithm/Icon/evolutionary-algorithm-4.icon

@@ -0,0 +1,12 @@
+(function evolve generation parent
+
+  (print (pad-left " " 3 generation) " " (... str parent) " " (fitness parent))
+
+  (return-when (perfect-fit? parent))
+
+  (let children (times c #(mutate parent))
+       fittest  (max-by fitness (... vec parent children)))
+
+  (recur (inc generation) fittest))
+
+(evolve 1 (times tsize rand-char))