Quantlib：為什麼利率掉期估值會拋出“執行時錯誤負時間”？

# Set evaluation date

spotRates = [0.02514, 0.026285, 0.027326299999999998,
        0.0279, 0.029616299999999998, 0.026526,
        0.026028, 0.0258695, 0.025958000000000002,
        0.0261375, 0.026355, 0.0266255,
        0.026898, 0.0271745, 0.02741,
        0.027666, 0.028107000000000004, 0.028412000000000003,
        0.028447, 0.0284165]

spotPeriod = [Period(1, Weeks), Period(1, Months),
         Period(3, Months), Period(6, Months),
         Period(9, Months), Period(1, Years),
         Period(3, Years),Period(5, Years)
         Period(10, Years),Period(15, Years), Period(20, Years),
         Period(30, Years), Period(50, Years)]

不得不更改一些東西，因為您有 20 個即期匯率但只有 13 個即期期，並添加了一個虛假的定價，但這是一個有效的範例。

import QuantLib as ql
import pandas as pd

todaysDate = ql.Date(13, 9, 2019)
calendar = ql.SouthAfrica()
day_count = ql.Actual365Fixed()
currency = ql.ZARCurrency()

todaysDate = calendar.adjust(todaysDate)
ql.Settings.instance().evaluationDate = todaysDate

spotRates = [0.02514, 0.026285, 0.027326299999999998,
        0.0279, 0.029616299999999998, 0.026526,
        0.026028, 0.0258695, 0.025958000000000002,
        0.0261375, 0.026355, 0.0266255,
        0.026898, 0.0271745, 0.02741,
        0.027666, 0.028107000000000004, 0.028412000000000003,
        0.028447, 0.0284165]

spotPeriod = [ql.Period(1, ql.Weeks), ql.Period(1, ql.Months),
         ql.Period(3, ql.Months), ql.Period(6, ql.Months),
         ql.Period(9, ql.Months), ql.Period(1, ql.Years),
         ql.Period(3, ql.Years),  ql.Period(5, ql.Years),
         ql.Period(10, ql.Years), ql.Period(15, ql.Years), ql.Period(20, ql.Years),
         ql.Period(30, ql.Years), ql.Period(50, ql.Years)]

dates = [calendar.advance(todaysDate, period) for period in spotPeriod]
curve = ql.ZeroCurve(dates, spotRates[:13], day_count, calendar)
yts = ql.YieldTermStructureHandle(curve)
engine = ql.DiscountingSwapEngine(yts)

issue_date = ql.Date(18, 4, 2018)
maturity_date = ql.Date(18, 4, 2028)
fixedRate = .09
index = ql.Jibar(ql.Period('3M'), yts)
fix_payment_frequency = ql.Annual
float_payment_frequency = ql.Quarterly

fixedSchedule = ql.MakeSchedule(issue_date, maturity_date, ql.Period('1Y'), calendar=calendar)
floatSchedule = ql.MakeSchedule(issue_date, maturity_date, ql.Period('3M'), calendar=calendar)
swap = ql.VanillaSwap(
   ql.VanillaSwap.Payer, 100,
   fixedSchedule, fixedRate, day_count,
   floatSchedule, index, 0, index.dayCounter()
   )

index.addFixing(ql.Date(18,7,2019), 0.02)

swap.setPricingEngine(engine)
data = []
for cf in map(ql.as_coupon, swap.leg(1)):
   if cf.date() > todaysDate:
       data.append({
           'accuralStart': cf.accrualStartDate(),
           'accrualEnd': cf.accrualEndDate(),
           'amount': cf.amount(),
           'rate': cf.rate(),
           'discount': yts.discount(cf.date())

       })
pd.DataFrame(data).head()

這將輸出：

我懷疑您試圖從曲線日期之前的日期獲得折扣因子。

引用自：https://quant.stackexchange.com/questions/51593