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Tina Müller 2016-12-05 23:44:36 +01:00
parent 9dc3c2bb62
commit bba7bfd280
13208 changed files with 134745 additions and 0 deletions
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26
Task/Fibonacci-word/EchoLisp/fibonacci-word.echolisp Normal file
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(lib 'struct)
(struct FW ( count0 count1 length string)) ;; a fibonacci word
(define (F-word n) ;; generator
(define a (F-word (1- n)))
(define b (F-word (- n 2)))
(FW
(+ (FW-count0 a) (FW-count0 b))
(+ (FW-count1 a) (FW-count1 b))
(+ (FW-length a) (FW-length b))
(if (> n 9) "..." (string-append (FW-string a) (FW-string b)))))
(remember 'F-word (vector 0 (FW 0 1 1 "1") (FW 1 0 1 "0")))
(define (entropy fw)
(define p (// (FW-count0 fw) (FW-length fw)))
(cond
((= p 0) 0)
((= p 1) 0)
(else (- 0 (* p (log2 p)) (* (- 1 p) (log2 (- 1 p)))))))
(define (task (n 38) (fw))
(for ((i (in-range 1 n)))
(set! fw (F-word i))
(printf "%3d %10d %24d %a"
i (FW-length fw) (entropy fw) (FW-string fw))))