AM Posted October 13, 2016 Share Posted October 13, 2016 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;; i needed a function who changes randomly lengths to rests ;;; step by step, and modify (enlarge) its rest-values over x-generations ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; (defun modify-lengths-to-rests (liste &key (items 1) (step -1) (factor 2) (enlarge-type 'add)) (let ((liste (loop for j in liste when (< j 0) collect (cond ((equal enlarge-type 'add) (+ step j)) ((equal enlarge-type 'augmented) (* factor j))) else collect j))) (loop for i in liste with repl = (rnd-pick (remove 0 liste :test #'>)) with cnt = 0 when (and (equal i repl) (< cnt items)) collect (* -1 (abs repl)) and do (incf cnt) else collect i))) ;;;; examples-1 -> ONE generation ;;;; evaluate a few times to see how it works (modify-lengths-to-rests '(1 1 1 2 2 2 3 3 3 4 4 4 -5 5 5) :items 1 :enlarge-type 'add) ;enlarge only values < 0 (modify-lengths-to-rests '(1 1 1 2 2 2 3 3 3 4 4 4 -5 5 5) :items 2 :enlarge-type 'add) ;enlarge only values < 0 (modify-lengths-to-rests '(1 1 1 2 2 2 3 3 3 4 4 4 -5 5 5) :items 3 :enlarge-type 'add) ;enlarge only values < 0 ;;;; examples-2 ;;;; recursiv - with x-generations (loop repeat 10 with seq = '(1 2 3 4 4 4 5 6 7) collect (setf seq (modify-lengths-to-rests seq :items 1 :enlarge-type 'augmented))) (loop repeat 10 with seq = '(1 2 3 4 4 4 5 6 7) collect (setf seq (modify-lengths-to-rests seq :items 1 :enlarge-type 'add))) Quote Link to comment Share on other sites More sharing options...
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