AM Posted April 24, 2017 Share Posted April 24, 2017 (edited) ;;; SWAPS THE POSITIONS SYMMETRICALLY AND RANDOMIZED ;;; n => number of generations, output: last gen or all gens... ;;; new-version works also for symmetrical-sequences! (special cas) (defun rnd-symmetrical-position-swap (n liste &key (out 'all)) (let ((n1) (n2)) (progn (setf liste (loop repeat n do (setf n1 (random (1- (list-length-divide liste))) n2 (random (1- (list-length-divide liste)))) collect (progn (setf liste (position-swap (list (list n1 n2) (list (- (1- (length liste)) n1) (- (1- (length liste)) n2))) liste))))) (cond ((equal out 'last) (car (last liste))) ((equal out 'all) (append liste)))))) (rnd-symmetrical-position-swap 2 '(1 2 3 4 3 2 1) :out 'last) (rnd-symmetrical-position-swap 5 '(1 2 3 4 5 6) :out 'last) (rnd-symmetrical-position-swap 2 '(a b c d e f g h) :out 'all) Edited April 24, 2017 by AM edited opmo 1 Quote Link to comment Share on other sites More sharing options...
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