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program to compute gears, with table
Hey guys, does this look right to you?
;; (print-gears '(34 50) '(12 13 15 17 19 21 23 25) 622) ;; ;; = ;; ;; 622 wheel ;; ;; chainring sprocket gear ;; ;; 34 25 2657.5360544880004 ;; 34 23 2888.626146182609 ;; 34 21 3163.7333982000005 ;; 34 19 3496.7579664315795 ;; 50 25 3908.1412566000004 ;; 34 17 3908.1412566000004 ;; 50 23 4247.97962673913 ;; 34 15 4429.226757480001 ;; 50 21 4652.549115000001 ;; 34 13 5110.64625863077 ;; 50 19 5142.291127105264 ;; 34 12 5536.5334468500005 ;; 50 17 5747.266553823531 ;; 50 15 6513.568761 ;; 50 13 7515.656262692309 ;; 50 12 8141.960951250001 (require 'cl-lib) (defun compute-gear (chainring sprocket wheel) (let*((pi 3.14159265) (radius (/ wheel 2.0)) (circum (* 2 radius pi)) (gear (* (/ chainring sprocket 1.0) circum))) (list chainring sprocket gear))) (defun gear (chainrings sprockets wheel) (let*((gears (cl-loop for c in chainrings append (cl-loop for s in sprockets collect (compute-gear c s wheel) ) ))) (cl-sort gears #'= :key #'cl-caddr))) (defun print-gears (chainrings sprockets wheel) (let ((out-buffer (get-buffer-create "*Gears*"))) (with-current-buffer out-buffer (erase-buffer) (insert (format "%s wheel\n\n" wheel)) (insert "chainring sprocket gear\n\n") (let ((gears (gear chainrings sprockets wheel))) (cl-loop for g in gears do (let ((c ( car g)) (s ( cadr g)) (d (cl-caddr g))) (insert (format " %s %s %s\n" c s d)) )))) (pop-to-buffer out-buffer) )) -- underground experts united http://user.it.uu.se/~embe8573 |
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