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47 lines
1.3 KiB
Scheme
47 lines
1.3 KiB
Scheme
;"plottest.scm" test charplot.scm
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;Copyright (C) 1992 Aubrey Jaffer
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;
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;Permission to copy this software, to redistribute it, and to use it
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;for any purpose is granted, subject to the following restrictions and
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;understandings.
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;
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;1. Any copy made of this software must include this copyright notice
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;in full.
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;
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;2. I have made no warrantee or representation that the operation of
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;this software will be error-free, and I am under no obligation to
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;provide any services, by way of maintenance, update, or otherwise.
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;
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;3. In conjunction with products arising from the use of this
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;material, there shall be no use of my name in any advertising,
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;promotional, or sales literature without prior written consent in
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;each case.
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(require 'charplot)
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(require 'random)
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(define strophoid
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(let ((l '()))
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(do ((x -1.0 (+ x 0.05)))
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((> x 4.0))
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(let* ((a (/ (- 2 x) (+ 2 x))))
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(if (>= a 0.0)
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(let* ((y (* x (sqrt a))))
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(set! l (cons (cons x y) l))
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(set! l (cons (cons x (- y)) l))))))
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l))
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(plot! strophoid "x" "y") (newline)
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(define unif
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(let* ((l 6)
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(v (make-vector l)))
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(do ((i (- l 1) (- i 1)))
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((negative? i))
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(vector-set! v i (cons i 0)))
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(do ((i 24 (- i 1))
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(r (random l) (random l)))
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((zero? i) (vector->list v))
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(set-cdr! (vector-ref v r) (+ 1 (cdr (vector-ref v r)))))))
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(plot! unif "n" "occur")
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