torstenanders Posted May 16, 2017 Share Posted May 16, 2017 For generating a harmonic rhythm, I needed to merge notes that are tied. If extracting only the length values with omn directly, then all ties are lost. (omn :length '((h c4 pizz q arco+tie) (q h tie) (h.))) => ((1/2 1/4) (1/4 1/2) (3/4)) So, I wrote myself a function that merges the lengths of tied notes. (lengths-with-merged-ties '((h c4 pizz q arco+tie) (q h tie) (h.))) => (1/2 1/2 5/4) The definition is below. Best, Torsten (defun lengths-with-merged-ties (sequence) "Returns a flat list of lengths that preserves the lengths in sequence including their tied notes. Example: (lengths-with-merged-ties '((h c4 pizz q arco+tie) (q h tie) (h.))) => (1/2 1/2 5/4) Contrast: (omn :length '((h c4 pizz q arco+tie) (q h tie) (h.))) => ((1/2 1/4) (1/4 1/2) (3/4))" (butlast (reduce #'(lambda (&optional accum pair2) (when (and accum pair2) (append (butlast accum 2) (if (equal (first (last accum)) 'tie) (list (+ (first (last (butlast accum))) (first pair2)) (second pair2)) (list (first (last (butlast accum))) (first pair2) (second pair2))) ))) (matrix-transpose (list (omn :length (flatten-omn sequence)) (mapcar #'(lambda (arts) (when (member 'tie arts) 'tie)) (mapcar #'disassemble-articulations (omn :articulation (flatten-omn sequence))))))))) ;; I shared the function disassemble-articulations alongside similar functions before, ;; but repeat it here for your convenience (defun disassemble-articulations (art) "Splits a combined OMN articulations into a list of its individual attributes. Example: (disassemble-articulations 'leg+ponte) => (leg ponte)" (mapcar #'intern (split-string (symbol-name art) :separator "+"))) AM 1 Quote Link to comment Share on other sites More sharing options...
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