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authorAnton Luka Šijanec <anton@sijanec.eu>2024-05-27 13:12:17 +0200
committerAnton Luka Šijanec <anton@sijanec.eu>2024-05-27 13:12:17 +0200
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tree79942a40514f5ab40c5901349c9fcd30c6c8dc0e /admin/survey/excel/PHPExcel/Shared/JAMA/examples/polyfit.php
parent2024-02-19 upstream (diff)
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diff --git a/admin/survey/excel/PHPExcel/Shared/JAMA/examples/polyfit.php b/admin/survey/excel/PHPExcel/Shared/JAMA/examples/polyfit.php
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@@ -1,73 +0,0 @@
-<?php
-require_once "../Matrix.php";
-/*
-* @package JAMA
-* @author Michael Bommarito
-* @author Paul Meagher
-* @version 0.1
-*
-* Function to fit an order n polynomial function through
-* a series of x-y data points using least squares.
-*
-* @param $X array x values
-* @param $Y array y values
-* @param $n int order of polynomial to be used for fitting
-* @returns array $coeffs of polynomial coefficients
-* Pre-Conditions: the system is not underdetermined: sizeof($X) > $n+1
-*/
-function polyfit($X, $Y, $n) {
- for ($i = 0; $i < sizeof($X); ++$i)
- for ($j = 0; $j <= $n; ++$j)
- $A[$i][$j] = pow($X[$i], $j);
- for ($i=0; $i < sizeof($Y); ++$i)
- $B[$i] = array($Y[$i]);
- $matrixA = new Matrix($A);
- $matrixB = new Matrix($B);
- $C = $matrixA->solve($matrixB);
- return $C->getMatrix(0, $n, 0, 1);
-}
-
-function printpoly( $C = null ) {
- for($i = $C->m - 1; $i >= 0; --$i) {
- $r = $C->get($i, 0);
- if ( abs($r) <= pow(10, -9) )
- $r = 0;
- if ($i == $C->m - 1)
- echo $r . "x<sup>$i</sup>";
- else if ($i < $C->m - 1)
- echo " + " . $r . "x<sup>$i</sup>";
- else if ($i == 0)
- echo " + " . $r;
- }
-}
-
-$X = array(0,1,2,3,4,5);
-$Y = array(4,3,12,67,228, 579);
-$points = new Matrix(array($X, $Y));
-$points->toHTML();
-printpoly(polyfit($X, $Y, 4));
-
-echo '<hr />';
-
-$X = array(0,1,2,3,4,5);
-$Y = array(1,2,5,10,17, 26);
-$points = new Matrix(array($X, $Y));
-$points->toHTML();
-printpoly(polyfit($X, $Y, 2));
-
-echo '<hr />';
-
-$X = array(0,1,2,3,4,5,6);
-$Y = array(-90,-104,-178,-252,-26, 1160, 4446);
-$points = new Matrix(array($X, $Y));
-$points->toHTML();
-printpoly(polyfit($X, $Y, 5));
-
-echo '<hr />';
-
-$X = array(0,1,2,3,4);
-$Y = array(mt_rand(0, 10), mt_rand(40, 80), mt_rand(240, 400), mt_rand(1800, 2215), mt_rand(8000, 9000));
-$points = new Matrix(array($X, $Y));
-$points->toHTML();
-printpoly(polyfit($X, $Y, 3));
-?>