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# Financial functions

## Simple financial functions

`fv` (rate, nper, pmt, pv[, when]) | Compute the future value.
`pv` (rate, nper, pmt[, fv, when]) | Compute the present value.
`npv` (rate, values) | Returns the NPV (Net Present Value) of a cash flow series.
`pmt` (rate, nper, pv[, fv, when]) | Compute the payment against loan principal plus interest.
`ppmt` (rate, per, nper, pv[, fv, when]) | Not implemented. Compute the payment against loan principal.
`ipmt` (rate, per, nper, pv[, fv, when]) | Not implemented. Compute the payment portion for loan interest.
`irr` (values) | Return the Internal Rate of Return (IRR).
`mirr` (values, finance_rate, ...) | Modified internal rate of return.
`nper` (rate, pmt, pv[, fv, when]) | Compute the number of periods.
`rate` (nper, pmt, pv, fv[, when, guess, tol, ...]) | Compute the rate of interest per period.

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