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