<?php
/**
* @author Michele Andreoli <michi.andreoli[at]gmail.com>
* @name index.php
* @version 0.1 updated 07-05-2010
* @license http://opensource.org/licenses/gpl-license-php GNU Public License
* @package FFT
*/
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Fast Fourier Transform, FFT</title>
</head>
<body>
<?php
require_once 'FFT.class.php';
// Define a generic function
$f = array();
for ($i = 0; $i < 256; $i++) {
if (($i >= 0 && $i <= 8) || ($i >= 248 && $i <= 255))
$f[$i] = 1;
else
$f[$i] = 0;
}
$fft = new FFT(256);
// Calculate the FFT of the function $f
$w = $fft->fft($f);
echo "<h1 style=\"font: bold 14px verdana;\">FFT: </h1>";
for ($i = 0; $i < $fft->getDim(); $i++)
echo "<p style=\"font: normal 10px verdana;\"><b>".$i."</b> (".$w[$i]->getReal().", ".$w[$i]->getImag().")</p>";
// Calculate the inverse FFT of the function $w
$w = $fft->ifft($w);
echo "<br/><h1 style=\"font: bold 14px verdana;\">FFT inverse:</h1>";
for ($i = 0; $i < $fft->getDim(); $i++)
echo "<p style=\"font: normal 10px verdana;\"><b>".$i."</b> (".$w[$i]->getReal().")</p>";
?>
</body>
</html>
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