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;"plottest.scm" test charplot.scm
;Copyright (C) 1992 Aubrey Jaffer
;
;Permission to copy this software, to modify it, to redistribute it,
;to distribute modified versions, 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 warranty 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)
(require 'random-inexact)
(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)
(histograph (do ((idx 99 (+ -1 idx))
(lst '() (cons (* .02 (random:normal)) lst)))
((negative? idx) lst))
"normal")
(newline)
(histograph (do ((idx 99 (+ -1 idx))
(lst '() (cons (random 5) lst)))
((negative? idx) lst))
"random")
(newline)
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