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PV Function
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| // Copyright (c) 2012 Sutoiku, Inc. (MIT License) | |
| function PV(rate, periods, payment, future, type) { | |
| // Initialize type | |
| var type = (typeof type === 'undefined') ? 0 : type; | |
| // Evaluate rate and periods (TODO: replace with secure expression evaluator) | |
| rate = eval(rate); | |
| periods = eval(periods); | |
| // Return present value | |
| if (rate === 0) { | |
| return - payment * periods - future; | |
| } else { | |
| return (((1 - Math.pow(1 + rate, periods)) / rate) * payment * (1 +rate * type) - future) / Math.pow(1 + rate, periods); | |
| } | |
| } |
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