Computes the H-infinity optimal causal filter (indirect B-spline filter) for the cubic spline.
[INPUT] d: delay
[OUTPUT] psi: the optimal filter psi(z) in a TF object gopt: optimal value
This file is based on the following paper: M. Nagahara and Y. Yamamoto, H-infinity optimal approxmation for causal spline interpolation, Signal Processing, Vol. 91, No. 2, pp. 176-184, 2011.
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***************** BOOTSTRAPPING RESULTS **********************
Time (Years)| Yield Curve | Discount Curve| Forward Curve |
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