Math
|
|
|
|
<?PHP
class pisearch
{
// public vars
var $max = 150000;
function one()
{
/* PI Search! - method 1*/
// In the books: 1+1/4+1/9+1/16+...=(PI^2)/6
// got from PHP doc -> PI: 3.14159265358979323846
// How much greater $max will, more exact the value will be
for ($x = 1; $x <= $this->max; $x++)
{
$r = 1 / ($x * $x);
$s += $r;
}
return sqrt(6 * $s);
//sqrt = x^(1/2)
}
function two()
{
/* PI Search! - method 2*/
// In the books: PI /2 = (2/1)*(2/3)*(4/3)*(4/5)*(6/5)(6/7)
// got from PHP doc -> PI: 3.14159265358979323846
// How much greater $max will, more exact the value will be
// SOME values to make for {} work
$dw = 1;
$l = 1;
$up = 2;
$pi = 4;
for ($x = 2; $x <= $this->max; $x++)
{
$l++;
if ($l % 2 != 0)
$up = $x + 1;
elseif ($l % 2 == 0)
$dw += 2;
$pi = $pi * ($up/$dw);
if ($l == 4)
$l = 0;
}
return $pi;
}
}
?>
|
|
|
Usage Example
|
<?PHP
$pisearch = new pisearch();
printf("PI of method ONE = %s<br>", $pisearch->one());
printf("PI of method TWO = %s<br>", $pisearch->two());
?>
|
|
|
Rate This Script
|
|
|
|
Store
Your email: