You originally had:
$nPrincipal * ( $nMonthlyInterest / (1 - (1 + $nMonthlyInterest) ^ -
$iMonths))
which, translate to in PHP
$nPrincipal * ( $nMonthlyInterest / (1 - pow( ( 1 +
$nMonthlyInterest ), -$iMonths ) ) )
On Sep 19, 2008, at 3:48 PM, Stephen Johnson wrote:
Right ... But that is producing even funkier results...
doing pow( (1-(1+$nMonthlyInterest)) , ($iMonths*-1) ) ;
Gives me :
4.2502451372964E-35 = 25000 * (0.0010416666666667 / 6.1270975733019E
+35);
From: Eric Gorr <mailist@xxxxxxxxxxxx>
I believe what you are looking is:
http://us2.php.net/manual/en/function.pow.php
number pow ( number $base , number $exp )
Returns base raised to the power of exp
On Sep 19, 2008, at 3:34 PM, Stephen Johnson wrote:
OK.. Math is NOT my forte ...
I am converting a site from ASP to PHP ... And this calc is in the
ASP Code
:
$nMonthlyInterest = $nRate / (12 * 100)
//' Calculate monthly payment
$nPayment = $nPrincipal * ( $nMonthlyInterest / (1 - (1 +
$nMonthlyInterest) ^ -$iMonths))
Which then gives me in PHP
0.0010416666666667 = 1.25 / (12 * 100);
-2.1701388888889 = 25000 * ( 0.0010416666666667 / (1 - (1 +
0.0010416666666667) ^ -12)) ::
^ is the problem ...
The solution SHOULD be 2,097.47 ... Not –2.17
Would be willing to help correct this and make it valid in PHP?
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