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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")