Jump to content

rnd-complete-seq


Recommended Posts

;; a function which fills up a sequence randomly - max-length = length sequence
;; (regardless of the number of cycles)


(defun rnd-complete-seq (n &key sequence (step 1) seed (sort '<) (exclude nil) (append-excluded nil))
  (let* ((testseq)
         (sequence (if (null exclude)
                    sequence 
                    (filter-remove exclude sequence)))
         (sequence (loop repeat (length sequence)
                     with sequence = (loop repeat n
                                       with seq = '()
                                       do (setf seq (append (rnd-unique step sequence :seed seed) seq))
                                       do (setf sequence (filter-remove seq sequence))
                                       collect seq)
                     for i in (if (equal sort '<)
                                (sort-asc sequence)
                                (sort-desc sequence))
                     collect i)))

    (if (null append-excluded)
      sequence 
      (progn 
        (cond ((pitchp (first (car (last sequence))))
               (setf testseq (pitch-to-midi sequence)))
              ((velocityp (first (car (last sequence))))
               (setf testseq (get-velocity sequence)))
              (t (setf testseq sequence)))

        (if (< (first (car (last testseq))) (second (car (last testseq))))
          (list sequence (sort-asc (append exclude (car (last sequence)))))
          (list sequence (sort-desc (append exclude (car (last sequence))))))))))


;;; EXAMPLES

(rnd-complete-seq 8 :sequence (expand-tonality '(b3 messiaen-mode6)))
=> ((b3) (b3 a4) (b3 a4 as4) (b3 f4 a4 as4) (b3 e4 f4 a4 as4) (b3 cs4 e4 f4 a4 as4) (b3 cs4 ds4 e4 f4 a4 as4) (b3 cs4 ds4 e4 f4 g4 a4 as4))
;or
=> ((as4) (e4 as4) (e4 f4 as4) (cs4 e4 f4 as4) (cs4 e4 f4 g4 as4) (b3 cs4 e4 f4 g4 as4) (b3 cs4 ds4 e4 f4 g4 as4) (b3 cs4 ds4 e4 f4 g4 a4 as4))
;or .... 


(rnd-complete-seq 5 :sequence '(0 1 2 3 4 5 6 7 8 9 10 11 12))
=> ((1) (1 7) (0 1 7) (0 1 7 9) (0 1 7 9 11))
;or 
=> ((0) (0 1) (0 1 11) (0 1 6 11) (0 1 6 11 12))
;or .... 


(rnd-complete-seq 5 :step 2 :sequence '(0 1 2 3 4 5 6 7 8 9 10 11 12))
=> ((1 7) (0 1 7 8) (0 1 5 7 8 12) (0 1 5 7 8 9 10 12) (0 1 2 5 7 8 9 10 11 12))

(rnd-complete-seq 5 :step 2 :sequence '(0 1 2 3 4 5 6 7 8 9 10 11 12) :seed 234)
=> ((4 12) (3 4 11 12) (2 3 4 10 11 12) (2 3 4 5 9 10 11 12) (1 2 3 4 5 8 9 10 11 12))


(rnd-complete-seq 5 :step 2 :sequence '(0 1 2 3 4 5 6 7 8 9 10 11 12) :sort '> :seed 234)
=> ((12 4) (12 11 4 3) (12 11 10 4 3 2) (12 11 10 9 5 4 3 2) (12 11 10 9 8 5 4 3 2 1))


(rnd-complete-seq 5 :step 2 :sequence '(pppp ppp pp p mp mf f ff fff ffff) :sort '> :seed 234)
=> ((ffff p) (ffff fff p pp) (ffff fff ff p pp ppp) (ffff fff ff f mp p pp ppp) (ffff fff ff f mf mp p pp ppp pppp))


;;; examples with EXCLUDE

(rnd-complete-seq 4 :sequence '(1 2 3 4 5 6 7 8) :exclude '(1 8))
=> ((5) (4 5) (2 4 5) (2 4 5 6))

(rnd-complete-seq 4 :sequence '(1 2 3 4 5 6 7 8) :exclude '(1 8) :append-excluded t)
=> (((7) (4 7) (4 5 7) (4 5 6 7)) (1 4 5 6 7 8))

(rnd-complete-seq 4 :sequence '(pppp ppp pp p mp mf f ff fff ffff) :exclude '(pppp ffff) :append-excluded t)
=> (((mf) (p mf) (ppp p mf) (ppp p mf f)) (pppp ppp p mf f ffff))

 

Edited by AM
extended version!
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

Terms of Use Privacy Policy