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#lang scribble/manual | |
This is a 3-argument curried function. | |
@defproc[(((lerp [lo number?]) | |
[hi number?]) | |
[alpha number?]) | |
number?]{ | |
Linear interpolation} |
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> (:print-type andmap) | |
(All (a c d b ...) | |
(case-> | |
(-> (-> a c : d) (Listof a) c) | |
(-> (-> a b ... b c) (Listof a) (Listof b) ... b (U True c)))) | |
> (λ ([a : Real] | |
[b : Symbol] | |
[c : Boolean] |
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#lang racket | |
(define (up-down x [so-far 1]) | |
(if (equal? x so-far) | |
(displayln x) | |
(begin (displayln so-far) | |
(up-down x (add1 so-far)) | |
(displayln so-far)))) |
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#lang rackmora | |
(def count10 (R_iota [10])) | |
(R_iota [10]) | |
(fn ((top 0)) | |
(unbox counting count10 1)) | |
(def sum | |
(fn ((top 0)) |
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#lang slideshow | |
(require (planet jaymccarthy/slideshow-latex)) | |
(latex-dpi 300) | |
(add-preamble #<<latex | |
\usepackage{amsmath} | |
latex | |
) |
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#lang typed/racket | |
;;; Typed Racket version of Martin Grabmü̈ller's "Algorithm W Step by Step" | |
;;; http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.65.7733 | |
;;; This is my first use of Typed Racket. I am looking to change this from | |
;;; following Haskell idiom to following Racket idiom. | |
;; An expression is a variable, a literal, an application, |
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#lang racket | |
(require redex) | |
(define-language L1 | |
(a integer) | |
(e variable-not-otherwise-mentioned | |
(* e e))) | |
(define-language L2 | |
(b string) |
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(define-language L1 | |
(a integer) | |
(e variable-not-otherwise-mentioned)) | |
(define-language L2 | |
(b string) | |
(e integer)) | |
(define-multilang-metafunction [L1 L2] | |
metafun-name : a L1:e -> b L2:e |
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; typing compose makes use of typechecker code for handling abstracted indices | |
(check-equal? | |
(judgment-holds | |
(type-of [] [] [] | |
(I-λ [(s1 Shape) (s2 Shape) (s3 Shape)] | |
(T-λ [α β γ] | |
(A [] [(λ [(f (Array (S) ((Array s1 α) -> (Array s2 β)))) | |
(g (Array (S) ((Array s2 β) -> (Array s3 γ))))] | |
(A [] [(λ [(x (Array s1 α))] (g (f x)))]))]))) | |
type) type) |
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> (judgment-holds | |
(type-of [] | |
[] | |
[] | |
(Λ [α β γ] | |
(A [] | |
[(λ [(f 0 (Array (S) ((Array (S) α) -> (Array (S) β)))) | |
(g 0 (Array (S) ((Array (S) β) -> (Array (S) γ))))] | |
(A [] [(λ [(x 0 (Array (S) α))] (g (f x)))]))])) | |
type) |
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