Posted April 9, 20178 yr ...an idea to manipulate lists of pitches/rhythms by "sampling" ;;; subfunction (defun sampling-list (liste start-position seq-length) (loop repeat seq-length for cnt = start-position then (incf cnt) when (= cnt (length liste)) do (setf cnt 0) collect (nth cnt liste))) ;;; MAIN: ;;; an value-list will be sampled by start-pos-list in the length of seq-length-list (defun structural-interferences (n value-list start-pos-list seq-length-list) (let ((start-pos-list (remove (length value-list) start-pos-list :test #'<))) (loop repeat n for start-pos = 0 then (incf start-pos) for seq-length = 0 then (incf seq-length) when (= start-pos (length start-pos-list)) do (setf start-pos 1) when (= seq-length (length seq-length-list)) do (setf seq-length 0) append (sampling-list value-list (nth start-pos start-pos-list) (nth seq-length seq-length-list))))) ;;something (list-plot (structural-interferences 21 '(1 2 3 4 5) '(0 1 2 3 4 5 6 7 8 9) '(1 3 2 4 1 2 2 3 1 1 1 1)) :point-radius 1 :style :fill) ;;"self-similar" (list-plot (structural-interferences 21 '(3 2 1 5 4 2) '(2 1 0 4 3 1) '(3 2 1 5 4 2)) :point-radius 1 :style :fill)
April 10, 20178 yr Author ... i think sometimes i'm faster when i code it for myself then to search in the library :-)
April 10, 20178 yr Author i work in another way... the tools has to follow the ideas and not my ideas are "what the tools can do" ;-)
April 13, 20178 yr > I would advise to search the library, you might find thinks you never thought of What strategies do you suggest for searching the rather large library of existing functions. Though this question sounds a bit simple, it really mean it seriously. The search facility only searches through function names, AFAIK, and a name like gen-surround is not exactly easy to guess. What other strategies could be there for finding relevant functions? Better support for finding relevant functions could perhaps be an important addition of version 2? Best, Torsten added 8 minutes later Dear André, > sampling-list BTW: The built-in Common Lisp function subseq is very similar, see http://www.lispworks.com/documentation/HyperSpec/Body/f_subseq.htm subseq is likely much faster than sampling-list, if that is important: calling nth very often in sampling-list needs to go through the input list again and again. Best, Torsten
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