numpy.ppmt(rate, per, nper, pv, fv=0, when='end')[源代码]

Compute the payment against loan principal.

rate : array_like

Rate of interest (per period)

per : array_like, int

Amount paid against the loan changes. The per is the period of interest.

nper : array_like

Number of compounding periods

pv : array_like

Present value

fv : array_like, optional

Future value

when : {{‘begin’, 1}, {‘end’, 0}}, {string, int}

When payments are due (‘begin’ (1) or ‘end’ (0))


pmt, pv, ipmt