Python numpy.nper()用法及代碼示例

numpy.pmt(rate，pmt，pv，fv，當=“結束”時)：此財務函數可幫助用戶計算定期付款的數量。

參數：
rate: [scalar or (M, )array] Rate of interest as decimal (not per cent) per period
pmt: [scalar or (M, )array] Payment value
fv : [scalar or (M, )array] Future value
pv : [scalar or (M, )array] present value
when: at the beginning (when = {‘begin’, 1}) or the end (when = {‘end’, 0}) of each period. Default is {‘end’, 0}.

返回： Number of periodic payments.

求解方程：

fv + pv*(1+rate)**nper + pmt*(1 + rate*when)/rate*((1 + rate)**nper - 1) == 0

or when rate == 0
fv + pv + pmt * nper == 0

代碼:

# Python program explaining  
# pmt() function  
  
import numpy as np  
  
'''  
Question:  
  
how much time would it take to pay-off a loan of  
$10, 000 at 10 % annual rate of interest, if we had  
$100 to pay each month ?  
'''
  
# rate    pmt    pv  
Solution = np.nper(0.1 / 12, -100, 10000)  
  
# Here fv = 0 ; Also Default value of fv = 0  
print("Solution - No. of periods:% f months" %(Solution)) 

輸出：

Solution - No. of periods:215.905777 months