main
Matthew Butterick 4 years ago
parent c562ddbdb7
commit b7608d35aa

@ -585,7 +585,11 @@
(define/contract (optimal-stop-min proc xs)
(procedure? (listof any/c) . -> . any/c)
(define-values (sample candidates) (split-at xs (inexact->exact (floor (* .458 (length xs))))))
;; coefficient from
;; https://www.math.ucla.edu/~tom/Stopping/sr2.pdf
(define optimal-stopping-coefficient .458)
(define-values (sample candidates)
(split-at xs (inexact->exact (floor (* optimal-stopping-coefficient (length xs))))))
(define threshold (argmin proc sample))
(or (for/first ([candidate (in-list candidates)]
#:when (<= (proc candidate) threshold))

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