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git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk/trunk@2 d0cd1f9f-072b-0410-8dd7-cf729c803f20
68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/**********************************************************************
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* File: quadlsq.h (Formerly qlsq.h)
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* Description: Code for least squares approximation of quadratics.
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* Author: Ray Smith
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* Created: Wed Oct 6 15:14:23 BST 1993
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*
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* (C) Copyright 1993, Hewlett-Packard Ltd.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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**********************************************************************/
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#ifndef QUADLSQ_H
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#define QUADLSQ_H
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#include "points.h"
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class QLSQ
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{
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public:
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QLSQ() { //constructor
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clear(); //set to zeros
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}
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void clear(); //initialize
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void add( //add element
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double x, //coords to add
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double y);
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void remove( //delete element
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double x, //coords to delete
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double y);
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INT32 count() { //no of elements
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return n;
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}
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void fit( //fit the given
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int degree); //return actual
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double get_a() { //get x squard
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return a;
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}
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double get_b() { //get x squard
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return b;
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}
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double get_c() { //get x squard
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return c;
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}
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private:
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INT32 n; //no of elements
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double a, b, c; //result
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double sigx; //sum of x
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double sigy; //sum of y
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double sigxx; //sum x squared
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double sigxy; //sum of xy
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double sigyy; //sum y squared
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long double sigxxx; //sum x cubed
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long double sigxxy; //sum xsquared y
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long double sigxxxx; //sum x fourth
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};
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#endif
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