Minggu, 13 Oktober 2013

PHP Indonesia - Facebook: tutorial para bola

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tutorial para bola
Oct 13th 2013, 14:17, by Hengky Prananda

Hengky Prananda 2:17pm Oct 13
tutorial para bola

<?php
function retval($inv) {
if (strpos($inv, "E-") !== false) return "0";
return $inv;
}
?>

<html>
<head>
<title>Parabola Line Graph - RJM Programming - http://www.rjmprogramming.com.au (Copyright &copy; 2013 rjmprogramming.com.au all rights reserved.)</title>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load("visualization", "1", {packages:["corechart"]});
google.setOnLoadCallback(drawChart);
function drawChart() {

var dataTable = new google.visualization.DataTable();
dataTable.addColumn('number', 'X');
dataTable.addColumn('number', 'Y');
dataTable.addRows([
<?php
//echo "here";
$minval = "-2";
$maxval = "1.5";
$se2 = "2";
$se1 = "-1";
$se0 = "-6";
$e2 = "2";
$e1 = "-1";
$e0 = "-6";
if (isset($_GET['minval'])) {
$minval = $_GET['minval'];
$maxval = $_GET['maxval'];
if ($minval == $maxval && $maxval == 1400) {
$minval = -10.0;
$maxval = 10.0;
}
$e2 = str_replace("+","",$_GET['e2']);
$e1 = str_replace("+","",$_GET['e1']);
$e0 = str_replace("+","",$_GET['e0']);
$se2 = $_GET['e2'];
$se1 = str_replace("++","+",str_replace("+-","-",("+".$_GET['e1'])));
$se0 = str_replace("++","+",str_replace("+-","-",("+".$_GET['e0'])));
}
$off = 1.0;
$c = "";
for ($x=($minval-$off); $x<($maxval+$off); $x+=0.1) {
$y = ((($e2) * ($x) * ($x)) + (($e1) * ($x)) + ($e0));
$c = "[".retval($x).",".retval($y)."]\n";
echo "[".retval($x).",".retval($y)."],\n";
}
if ($minval != $maxval) {
$x = ($maxval+$off);
$y = ((($e2) * (($maxval)+$off) * (($maxval)+$off)) + (($e1) * (($maxval)+$off)) + ($e0));
echo "[".retval($x).",".retval($y)."]\n";
} else {
echo $c;
}
echo " ]);\n";
echo " var dataView = new google.visualization.DataView(dataTable);\n";

echo " var options = {\n";
echo " backgroundColor: 'lightgray',\n";
echo " title: 'Parabola y = ".$se2."x^2 ".$se1."x ".$se0."'\n";
echo " };\n";

?>
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(dataTable, options);
}

function ask() {
if (document.URL.indexOf("&") == (0 - 1)) {
var sqval = prompt("Enter ??? of Parabola graph ... y = ???x^2 + ??x + ?", "0");
var nonsqval = prompt("Enter ?? of Parabola graph ... y = " + sqval + "x^2 + ??x + ?", "0");
var val = prompt("Enter ? of Parabola graph ... y = " + sqval + "x^2" + nonsqval + "x + ?", "0");
var minval=-600.0;
var maxval=-600.0;
var x=minval, y, goes=0;
y = eval(( (sqval) * (minval) * (minval)) + ( (nonsqval) * (minval) ) + (val));
if (y < 0) {
while (y < 0 && goes < 2000) {
minval = eval(minval + 1.0);
y = eval(( (sqval) * (minval) * (minval)) + ( (nonsqval) * (minval) ) + (val));
goes = eval(goes + 1);
}
if (goes < 2000) {
goes = 0;
maxval = minval;
y = eval(( (sqval) * (maxval) * (maxval)) + ( (nonsqval) * (maxval) ) + (val));
while (y > 0 && goes < 2000) {
maxval = eval(maxval + 1.0);
y = eval(( (sqval) * (maxval) * (maxval)) + ( (nonsqval) * (maxval) ) + (val));
goes = eval(goes + 1);
}
} else {
minval = -10.0;
maxval = 10.0;
}
} else {
while (y > 0 && goes < 2000) {
minval = eval(minval + 1.0);
y = eval(( (sqval) * (minval) * (minval)) + ( (nonsqval) * (minval) ) + (val));
goes = eval(goes + 1);
}
if (goes < 2000) {
goes = 0;
maxval = minval;
y = eval(( (sqval) * (maxval) * (maxval)) + ( (nonsqval) * (maxval) ) + (val));
while (y < 0 && goes < 2000) {
maxval = eval(maxval + 1.0);
y = eval(( (sqval) * (maxval) * (maxval)) + ( (nonsqval) * (maxval) ) + (val));
goes = eval(goes + 1);
}
} else {
maxval = minval;
}
}
if (nonsqval.indexOf("+") == (0 - 1)) {
if (nonsqval.indexOf("-") == (0 - 1)) {
nonsqval = "+" + nonsqval;
}
}
if (val.indexOf("+") == (0 - 1)) {
if (val.indexOf("-") == (0 - 1)) {
val = "+" + val;
}
}
if (nonsqval.replace("0","").length > 0 || sqval.replace("0","").length > 0 || val.replace("0","").length > 0) {
window.location = "./parabola_lgraph.php?minval=" + minval + "&maxval=" + maxval + "&e2=" + sqval + "&e1=" + nonsqval + "&e0=" + val;
}
}
}
</script>
</head>
<body onload="ask();">
<h1>Parabola Line Graph</h1>
<div id="chart_div" style="width: 900px; height: 500px; background-color: yellow;"></div>
<a title="Another Line Graph" href="./parabola_lgraph.php">Another parabola graph?</a>
</body>
</html>

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