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;;; use with-sound to write the data to a sound file: ./snd heart.scm medfly
(require snd-ws.scm)
;;; turn off clipping (the numbers will be between 70 and 150)
(set! (mus-clipping) #f)
(set! *clm-clipped* #f)
(set! (with-inset-graph) #f)
(when (not (= (length (script-args)) 2))
(error 'no-data "data file missing: snd heart.scm data"))
;;; tell Snd not to try to load the data file (as scheme code)
(set! (script-arg) (+ 1 (script-arg)))
;;; search for "...[<number>am|pm <number>/<number>...", put the two readings in a stereo file
(let ((hpsum 0) ; for average readings
(lpsum 0))
(let ((ind (find-sound
(with-sound (:channels 4 :sample-type mus-lfloat)
(let ((samp 0))
(call-with-input-file
(list-ref (script-args) 1) ; invocation arg = text file of data ("snd heart.scm data.txt")
(let ((average (make-moving-average 14)) ; 2-week average
(average1 (make-moving-average 90))) ; 3-month average
(lambda (file)
(let loop ((line (read-line file #t)))
(or (eof-object? line)
(do ((len (length line))
(i 0 (+ 1 i)))
((>= i (- len 12))
(loop (read-line file #t)))
(when (and (char=? (line i) #\[)
(char=? (line (+ i 3)) #\m)
(memv (line (+ i 2)) '(#\a #\p)))
(let ((hp (string->number (substring line (+ i 5) (+ i 8))))
(lp (string->number (substring line (+ i 9) (+ i 11)))))
(when (and (number? hp)
(number? lp))
(set! hpsum (+ hpsum hp))
(set! lpsum (+ lpsum lp))
(out-any samp hp 0) ; output the readings
(out-any samp lp 1)
(out-any samp 125 2)
(out-any samp 83 3)
;(out-any samp (max 90 (moving-average average (* 0.5 (+ lp hp)))) 4)
;(out-any samp (max 90 (moving-average average1 (* 0.5 (+ lp hp)))) 5)
(set! samp (+ 1 samp))))))))))))))))
;; now display the data with y-axis bounds between 65 and 150, both traces in the same graph, x-axis in "samples" (readings)
(set! (channel-style ind) channels-superimposed)
(do ((chan 0 (+ 1 chan)))
((= chan 4))
(set! (x-axis-style ind chan) x-axis-in-samples)
(set! (x-axis-label ind chan) "days")
(set! (y-bounds ind chan) (list 65 150)))
;; print the average readings over the full sequence
(snd-print (format #f ";average: ~A/~A~%"
(round (/ hpsum (framples)))
(round (/ lpsum (framples)))))))
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