| Package home | Report new bug | New search | Development Roadmap | Status: Open | Feedback | All | Closed Since Version 1.0.1 |
| Request #8624 | quickly execution | ||
|---|---|---|---|
| Submitted: | 2006-09-03 18:53 UTC | ||
| From: | b_j at tar dot hu | Assigned: | alejandrop |
| Status: | Closed | Package: | Math_Finance (version 1.0.0) |
| PHP Version: | Irrelevant | OS: | |
| Roadmaps: | (Not assigned) | ||
[2006-09-03 18:53 UTC] b_j at tar dot hu
(Barczi József)
Description:
------------
Math/Finance.php
presentValue:
//$pv = (-$pmt * (1 + $rate * $type) * ((pow(1 + $rate, $nper) - 1) / $rate) - $fv) / pow(1 + $rate, $nper);
$q=pow(1 + $rate, $nper);
$pv = (-$pmt * (1 + $rate * $type) * (($q - 1) / $rate) - $fv) / $q;
futureValue:
//$fv = -$pv * pow(1 + $rate, $nper) - $pmt * (1 + $rate * $type) * (pow(1 + $rate, $nper) - 1) / $rate;
$q=pow(1 + $rate, $nper);
$fv = -$pv * $q - $pmt * (1 + $rate * $type) * ($q - 1) / $rate;
payment:
//$pmt = (-$fv - $pv * pow(1 + $rate, $nper)) / (1 + $rate * $type) / ((pow(1 + $rate, $nper) - 1) / $rate);
$q=pow(1 + $rate, $nper);
//$pmt = (-$fv - $pv * $q) / (1 + $rate * $type) / (($q - 1) / $rate);
$pmt = (-$fv - $pv * $q * $rate) / ((1 + $rate * $type) * ($q - 1)) ;
_tvm:
//return $pv * pow(1 + $rate, $nper) + $pmt * (1 + $rate * $type) * (pow(1 + $rate, $nper) - 1) / $rate + $fv;
$q=pow(1 + $rate, $nper);
return $pv * $q + $pmt * (1 + $rate * $type) * ($q - 1) / $rate + $fv;
_dtvm:
/*
return
$nper * $pv * pow(1 + $rate, $nper - 1) + $pmt *
($type * (pow(1 + $rate, $nper) - 1) / $rate
+ (1 + $rate * $type) * ($nper * $rate * pow(1 + $rate, $nper - 1)
- pow(1 + $rate, $nper) + 1) / pow($rate,2));
*/
$q =pow(1 + $rate, $nper);
$q1=pow(1 + $rate, $nper - 1);
$q2=pow($rate,2);
return
$nper * $pv * $q1 + $pmt * ($type * ($q - 1) / $rate +
(1 + $rate * $type) * ($nper * $rate * $q1 - $q + 1) / $q2);
Comments
[2007-03-10 12:13 UTC] alejandrop
(Alejandro Pedraza)
Fixed for next version.
(you made a mistake in the last operation in the payment function by the way)