src/common/linregr.h

/* RCSid: $Id$ */
/*
 * Header file for linear regression calculation.
 */

/* ====================================================================
 * The Radiance Software License, Version 1.0
 *
 * Copyright (c) 1990 - 2002 The Regents of the University of California,
 * through Lawrence Berkeley National Laboratory.   All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *         notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *           if any, must include the following acknowledgment:
 *             "This product includes Radiance software
 *                 (http://radsite.lbl.gov/)
 *                 developed by the Lawrence Berkeley National Laboratory
 *               (http://www.lbl.gov/)."
 *       Alternately, this acknowledgment may appear in the software itself,
 *       if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
 *       and "The Regents of the University of California" must
 *       not be used to endorse or promote products derived from this
 *       software without prior written permission. For written
 *       permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Radiance",
 *       nor may "Radiance" appear in their name, without prior written
 *       permission of Lawrence Berkeley National Laboratory.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Lawrence Berkeley National Laboratory.   For more
 * information on Lawrence Berkeley National Laboratory, please see
 * <http://www.lbl.gov/>.
 */

typedef struct {
        double  xs, ys, xxs, yys, xys;
        int     n;
} LRSUM;

typedef struct {
        double  slope, intercept, correlation;
} LRLIN;

#define lrpoint(x,y,l)  ((l)->xs+=(x),(l)->ys+=(y),(l)->xxs+=(x)*(x), \
                        (l)->yys+=(y)*(y),(l)->xys+=(x)*(y),++(l)->n)

#define lrxavg(l)       ((l)->xs/(l)->n)
#define lryavg(l)       ((l)->ys/(l)->n)
#define lrxvar(l)       (((l)->xxs-(l)->xs*(l)->xs/(l)->n)/(l)->n)
#define lryvar(l)       (((l)->yys-(l)->ys*(l)->ys/(l)->n)/(l)->n)
#define lrxdev(l)       sqrt(((l)->xxs-(l)->xs*(l)->xs/(l)->n)/((l)->n-1))
#define lrydev(l)       sqrt(((l)->yys-(l)->ys*(l)->ys/(l)->n)/((l)->n-1))

#ifdef NOPROTO

extern void     lrclear();
extern int      flrpoint();
extern int      lrfit();

#else

extern void     lrclear(LRSUM *l);
extern int      flrpoint(double x, double y, LRSUM *l);
extern int      lrfit(LRLIN *r, LRSUM *l);

#endif
Revision:	2.3
Committed:	Sat Feb 22 02:07:22 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.2:	+72 -4 lines
Log Message:	Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
#	Content
1	/* RCSid: $Id$ */
2	/*
3	* Header file for linear regression calculation.
4	*/
5
6	/* ====================================================================
7	* The Radiance Software License, Version 1.0
8	*
9	* Copyright (c) 1990 - 2002 The Regents of the University of California,
10	* through Lawrence Berkeley National Laboratory. All rights reserved.
11	*
12	* Redistribution and use in source and binary forms, with or without
13	* modification, are permitted provided that the following conditions
14	* are met:
15	*
16	* 1. Redistributions of source code must retain the above copyright
17	* notice, this list of conditions and the following disclaimer.
18	*
19	* 2. Redistributions in binary form must reproduce the above copyright
20	* notice, this list of conditions and the following disclaimer in
21	* the documentation and/or other materials provided with the
22	* distribution.
23	*
24	* 3. The end-user documentation included with the redistribution,
25	* if any, must include the following acknowledgment:
26	* "This product includes Radiance software
27	* (http://radsite.lbl.gov/)
28	* developed by the Lawrence Berkeley National Laboratory
29	* (http://www.lbl.gov/)."
30	* Alternately, this acknowledgment may appear in the software itself,
31	* if and wherever such third-party acknowledgments normally appear.
32	*
33	* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
34	* and "The Regents of the University of California" must
35	* not be used to endorse or promote products derived from this
36	* software without prior written permission. For written
37	* permission, please contact [email protected].
38	*
39	* 5. Products derived from this software may not be called "Radiance",
40	* nor may "Radiance" appear in their name, without prior written
41	* permission of Lawrence Berkeley National Laboratory.
42	*
43	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
44	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
45	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
46	* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
47	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
49	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
50	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
51	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
52	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
53	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
54	* SUCH DAMAGE.
55	* ====================================================================
56	*
57	* This software consists of voluntary contributions made by many
58	* individuals on behalf of Lawrence Berkeley National Laboratory. For more
59	* information on Lawrence Berkeley National Laboratory, please see
60	* <http://www.lbl.gov/>.
61	*/
62
63	typedef struct {
64	double xs, ys, xxs, yys, xys;
65	int n;
66	} LRSUM;
67
68	typedef struct {
69	double slope, intercept, correlation;
70	} LRLIN;
71
72	#define lrpoint(x,y,l) ((l)->xs+=(x),(l)->ys+=(y),(l)->xxs+=(x)*(x), \
73	(l)->yys+=(y)(y),(l)->xys+=(x)(y),++(l)->n)
74
75	#define lrxavg(l) ((l)->xs/(l)->n)
76	#define lryavg(l) ((l)->ys/(l)->n)
77	#define lrxvar(l) (((l)->xxs-(l)->xs*(l)->xs/(l)->n)/(l)->n)
78	#define lryvar(l) (((l)->yys-(l)->ys*(l)->ys/(l)->n)/(l)->n)
79	#define lrxdev(l) sqrt(((l)->xxs-(l)->xs*(l)->xs/(l)->n)/((l)->n-1))
80	#define lrydev(l) sqrt(((l)->yys-(l)->ys*(l)->ys/(l)->n)/((l)->n-1))
81
82	#ifdef NOPROTO
83
84	extern void lrclear();
85	extern int flrpoint();
86	extern int lrfit();
87
88	#else
89
90	extern void lrclear(LRSUM *l);
91	extern int flrpoint(double x, double y, LRSUM *l);
92	extern int lrfit(LRLIN r, LRSUM l);
93
94	#endif