numpy.nper(rate, pmt, pv, fv=0, when='end') [source]
Compute the number of periodic payments. Parameters:
rate : array_like Rate of interest (per period) pmt : array_like Payment pv : array_like Present value fv : array_like, optional Future value when : {{?begin?, 1}, {?end?, 0}}, {string, int}, optional When payments are due (?begin? (1) or ?end? (0)) Notes The number of periods nper is computed by solving the equation: fv + pv*(1+rate)**nper + pmt*(1+rate*when)/rate*((1+rate)