#lang scheme
;;; PLT Scheme Science Collection
;;; chi-squared-histogram-example.ss
;;; Copyright (c) 2004-2008 M. Douglas Williams
;;;
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Lesser General Public
;;; License as published by the Free Software Foundation; either
;;; version 2.1 of the License, or (at your option) any later version.
;;;
;;; This library is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;;; Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this library; if not, write to the Free
;;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
;;; 02111-1307 USA.
;;;
;;; -------------------------------------------------------------------
;;;

(require (planet "chi-squared.ss" ("williams" "science.plt")
                 "random-distributions"))
(require (planet "histogram-with-graphics.ss"
                 ("williams" "science.plt")))

(let ((h (make-histogram-with-ranges-uniform 40 0.0 10.0)))
  (do ((i 0 (+ i 1)))
      ((= i 10000) (void))
    (histogram-increment! h (random-chi-squared 3.0)))
  (histogram-plot h "Histogram of the Chi Squared Distribution"))