The following example randomly segments a list of given pitches into progressively increasing sublist of elements. I can't seem to recall a function one could use instead of rnd-repeat that would do the same but not randomly, preserving the original order or pitches => (c4) (d4 e4) (f4 g4 a4), etc.

 

Thank you!

 

(setf pitches '(c4 d4 e4 f4 g4 a4 b4 c5))
(setf seq 
      (make-omn
       :pitch (rnd-repeat (gen-integer 1 4) pitches)
       :length '(1/16)
       :velocity '(f)
       :articulation '(stacc)
       :span :pitch))

 

(gen-divide '(1 2 3 4 5 6) '(1 2 3 4 5 6 7 8 9 10))
=> ((1) (2 3) (4 5 6) (7 8 9 10))

 

too late 🙂

(setf pitches '(c4 d4 e4 f4 g4 a4 b4 c5))
(setf seq 
      (make-omn
       :pitch (gen-divide (gen-integer 1 4) pitches)
       :length '(1/16)
       :velocity '(f)
       :articulation '(stacc)
       :span :pitch))

 

Thanks so much! That's it - so elegant. I just couldn't remember gen-divide. 😄