I think you need to do pow((1+$nMonthlyInterest),($iMonths*-1)) Eugene 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); > > > -- > Stephen Johnson c | eh > The Lone Coder > > http://www.thelonecoder.com > continuing the struggle against bad code > > http://www.fortheloveofgeeks.com > I¹m a geek and I¹m OK! > -- > > > > >> 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? > > > -- --------------------------------------------------------------------- Eugene Mah, M.Sc., DABR eugenem@xxxxxxxxxxxxx Medical Physicist/Misplaced Canuck maheug@xxxxxxxx Department of Radiology eugenemah@xxxxxxxxx Medical University of South Carolina "For I am a Bear of Very Little Charleston, South Carolina Brain, and long words Bother http://www.netcom.com/~eugenem/ me." Winnie the Pooh http://radinfo.musc.edu/~eugenem/blog/ PGP KeyID = 0x1F9779FD, 0x319393F4 PGP keys available on request ICQ 3113529 O- --------------------------------------------------------------------- -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
