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(require 'org-fc-core)
;;; Main Algorithm
(defun nth-tn (n)
"The mathematical formula for the Nth triangular number."
(if (zerop n)
0
(/ (* n (1+ n)) 2.0)))
(defun org-fc-algo-tn-next-parameters (ease box interval rating)
"Calculate the next parameters of a card, based on the review RATING.
EASE, BOX and INTERVAL are the current parameters of the card."
(let*
((incorrect-at-edge
(and
(eq rating 'incorrect)
(eq box 0)))
(incorrect (eq rating 'incorrect))
(correct t)
(next-ease
(cond
(incorrect-at-edge (1+ ease))
(incorrect (1+ ease))
(correct ease)))
(next-box
(cond
(incorrect-at-edge box)
(incorrect (1- box))
(correct (1+ box))))
(next-interval (nth-tn next-box)))
(list next-ease next-box next-interval)))
(defun org-fc-algo-tn-initial-review-data (position)
"Initial TN review data for POSITION."
(let
((box 0)
(ease 0)
(interval 1.0)
(due (org-fc-timestamp-in 1.0)))
(list position ease box interval due)))
;;; Footer
(provide 'org-fc-algo-tn)
;; org-fc-algo-tn.el ends here.
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