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error warning: Undeclared free variable

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Here is what I've hacked together, thanks for looking into it:

(defun plot-pcs-distr (x)

(setf c (list (count '0 (flatten (get-pcs x)))))
(setf cs (list (count '1 (flatten (get-pcs x)))))
(setf d (list (count '2 (flatten (get-pcs x)))))
(setf ds (list (count '3 (flatten (get-pcs x)))))
(setf e (list (count '4 (flatten (get-pcs x)))))
(setf f (list (count '5 (flatten (get-pcs x)))))
(setf fs (list (count '6 (flatten (get-pcs x)))))
(setf g (list (count '7 (flatten (get-pcs x)))))
(setf gs (list (count '8 (flatten (get-pcs x)))))
(setf a (list (count '9 (flatten (get-pcs x)))))
(setf bb (list (count '10 (flatten (get-pcs x)))))
(setf b (list (count '11 (flatten (get-pcs x)))))

(setf all (append c cs d ds e f fs g gs a bb b))

(setf liste (loop for x in all
      for y in '(c cis d dis e f fis g gis a bes b)
  collect (list x y)))

(sort liste #'< :key #'first)

(setf liste-plot (loop for i in all
      for j in '(0 1 2 3 4 5 6 7 8 9 10 11)
  collect (list j i)))

(xy-plot liste-plot
         :join-points t
         :point-radius 2
         :style :fill
         :point-style :square)


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I've tried to get an overview of which pitches are used how many times in a stem:


(plot-pcs-distr  '((q c3 c3 d4 f5)(e fs2 fs2 fs2 fs2 fs2 gs4)))

==>((0 2) (1 0) (2 1) (3 0) (4 0) (5 1) (6 5) (7 0) (8 1) (9 0) (10 0) (11 0))

so I can see at a glance there are 2 c's, zero cis's, one d and so forth..


and the plot:

Bildschirmfoto 2021-09-12 um 17.21.11.jpg

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Here it is:


(defun pcs-count-plot (sequence)
  (do-verbose ("pcs-count-plot")
    (let* ((i (sort-asc
                  (melodize (omn :pitch sequence)))))))
           (r (count-repeat i))
           (l (mapcar 'list (remove-duplicates i) r)))
      (xy-plot l
               :point-radius 4
               :style :axis
               :point-style :hollow)


(pcs-count-plot omn)
=> ((0 2) (2 1) (5 1) (6 5) (8 1))


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