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| <?
/********************************************************
** Permutations, Combinations and Factorials
**
** Author.: leapinglangoor [ leapinglangoor@yahoo.co.in ]
** Date...: 12th feb 2005
** Version: v1.2
**
** Desc...: Permutations and combinations are a major part
** of maths and here it is in PHP
**
********************************************************/
class maths
{
function fact( $num )
{
$res = 1;
for ($i = 2; $i <= $num; $i++)
{
$res *= $i;
}
return $res;
}
function perms( $n, $r )
{
if( $r > $n )
{
return 0;
}
$i = 0;
$res = 1;
while( $i < $r )
{
$res = $res * $n;
$i++;
$n--;
}
return $res;
}
function combos( $n, $r )
{
if( $r > $n )
{
return 0;
}
$res = perms( $n, $r );
$res = $res / fact( $r );
return $res;
}
} // End class math
?> | |
example1.php:
| <?php
include( 'math.php' );
$maths = new maths;
$n = 5;
$r = 3;
$n = 5;
$r = 3;
$maths->fact( $n ); // Factorial of $n
echo $m->fact( $n ); // returns 120
$maths->perms( $n, $r ); // Permutations of $n taking $r things at a time.
echo $m->perms( $n, $r ); // returns 60
$maths->combos( $n, $r ); // Combinations of $n taking $r things at a time.
echo $m->cobos( $n, $r ); // returns 10
?> | |
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| | | | paulz leex wrote : 1321
can not run, with error :
Warning: Unterminated comment starting line 3 in C:\Program Files\Apache Group\Apache2\htdocs\per2.php on line 3
| | | | leapinglangoor wrote : 1322
uhmmmm... Is it just me, or is the example showing only "<?php" - somebody`s gotto really look into this!!!
| | | | Boaz Yahav wrote :1323
fixed :)
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