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])	Compute the payment against loan principal.
ipmt(rate, per, nper, pv[, fv, when])	Compute the interest portion of a payment.
irr(values)	Return the Internal Rate of Return (IRR).
mirr(values, finance_rate, reinvest_rate)	Modified internal rate of return.
nper(rate, pmt, pv[, fv, when])	Compute the number of periodic payments.
rate(nper, pmt, pv, fv[, when, guess, tol, …])	Compute the rate of interest per period.