Re: Calculation assistance.. :)

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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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