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substitute markov transition-weight

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;;; little program to change markov-weight for a specific value
;;; to give markov a "rule-tendency" 

(setq transitions '((a (b 1) (c 3) (d 2) (e 1))
                    (b (a 2) (d 3))
                    (c (a 2) (e 1) (b 3))
                    (d (c 2) (b 1) (a 3))
                    (e (a 2) (b 2) (d 1))))

(defun substitute-transition-weight (transition-list value new-weight)
    for j in transition-list
    collect (append (list (first j))
                    (loop repeat (1- (length j))
                      for cnt = 1 then (incf cnt)
                      when (equal (first (nth cnt j)) value)
                      collect (list (first (nth cnt j)) new-weight)
                      else collect (nth cnt j)))))

(substitute-transition-weight transitions 'a 100)

;;; example for "concrete use"

(loop repeat 20
  with transitions = '((a (b 3) (c 3) (a 2))
                       (b (a 2) (b 3) (c 5))
                       (c (a 2) (c 1)))
  with weight = 1
  do (setq transitions (substitute-transition-weight transitions 'a weight))
  do (incf weight 2)
  collect (gen-markov-from-transitions transitions
	                             :size 20 :start 'a))

best wishes 


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