<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html>
<head>
<title>Example use of EvalMath</title>
</head>
<body>
<form method="post" action="<?=$_SERVER['PHP_SELF']?>">
y(x) = <input type="text" name="function" value="<?=(isset($_POST['function']) ? htmlspecialchars($_POST['function']) : '')?>">
<input type="submit">
</form>
<?
if (isset($_POST['function']) and $_POST['function']) {
include('evalmath.class.php');
$m = new EvalMath;
$m->suppress_errors = true;
if ($m->evaluate('y(x) = ' . $_POST['function'])) {
print "\t<table border=\"1\">\n";
print "\t\t<tr><th>x</th><th>y(x)</th>\n";
for ($x = -2; $x <= 2; $x+=.2) {
$x = round($x, 2);
print "\t\t<tr><td>$x</td><td>" . $m->e("y($x)") . "</td></tr>\n";
}
print "\t</table>\n";
} else {
print "\t<p>Could not evaluate function: " . $m->last_error . "</p>\n";
}
}
?>
</body>
</html>
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