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quadlsq.h
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1 /**********************************************************************
2 * File: quadlsq.h (Formerly qlsq.h)
3 * Description: Code for least squares approximation of quadratics.
4 * Author: Ray Smith
5 * Created: Wed Oct 6 15:14:23 BST 1993
6 *
7 * (C) Copyright 1993, Hewlett-Packard Ltd.
8 ** Licensed under the Apache License, Version 2.0 (the "License");
9 ** you may not use this file except in compliance with the License.
10 ** You may obtain a copy of the License at
11 ** http://www.apache.org/licenses/LICENSE-2.0
12 ** Unless required by applicable law or agreed to in writing, software
13 ** distributed under the License is distributed on an "AS IS" BASIS,
14 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 ** See the License for the specific language governing permissions and
16 ** limitations under the License.
17 *
18 **********************************************************************/
19
20 #ifndef QUADLSQ_H
21 #define QUADLSQ_H
22
23 #include "points.h"
24
25 class QLSQ
26 {
27 public:
28 QLSQ() { //constructor
29 clear(); //set to zeros
30 }
31 void clear(); //initialize
32
33 void add( //add element
34 double x, //coords to add
35 double y);
36 void remove( //delete element
37 double x, //coords to delete
38 double y);
39 inT32 count() { //no of elements
40 return n;
41 }
42
43 void fit( //fit the given
44 int degree); //return actual
45 double get_a() { //get x squard
46 return a;
47 }
48 double get_b() { //get x squard
49 return b;
50 }
51 double get_c() { //get x squard
52 return c;
53 }
54
55 private:
56 inT32 n; //no of elements
57 double a, b, c; //result
58 double sigx; //sum of x
59 double sigy; //sum of y
60 double sigxx; //sum x squared
61 double sigxy; //sum of xy
62 double sigyy; //sum y squared
63 long double sigxxx; //sum x cubed
64 long double sigxxy; //sum xsquared y
65 long double sigxxxx; //sum x fourth
66 };
67 #endif