http://quantlib.414.s1.nabble.com/convergence-error-for-flat-yield-curve-using-cubic-spline-tp15858p15862.html
> Hi all,
> Can someone help point out what I am doing wrong? I am getting convergence
> errors when trying to bootstrap a yield curve using cubic spline. I have
> narrowed it down to a test case which is just a flat yield curve with 3
> instruments (1w and 1m cash and 2y swap) all at 6%.
>
> The main code is:
>
> depoFRASwapInstruments.push_back(d1w);
> depoFRASwapInstruments.push_back(d1m);
> depoFRASwapInstruments.push_back(s2y);
>
> boost::shared_ptr<YieldTermStructure> depoFRASwapTermStructure(new
> PiecewiseYieldCurve<ZeroYield, Cubic>(settlementDate,
> depoFRASwapInstruments, termStructureDayCounter, tolerance,
> Cubic(CubicInterpolation::Spline, false,
> CubicInterpolation::SecondDerivative, 0.0,
> CubicInterpolation::SecondDerivative, 0.0)));
>
> // get 1 month discfact
> std::cout << "1-month discount factor: " << std::setprecision(8) <<
> depoFRASwapTermStructure->discount(1 / 12.0, false);
>
> the error it returns is "convergence not reached after 99 iterations".
>
> I think the code is fine as sometimes it does work (ie. if I use flat 5% it
> works). But I often get convergence errors making things unstable. Am i
> missing something? Does it just not converge?
>
> Have attached the entire code.
>
> Thanks,
> Jon
>
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