Computes the H-infinity optimal causal filter (indirect B-spline filter) for the cubic spline.
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.
Masaaki Nagahara (2021). H-infinity optimal causal IIR inverse filter for the cubic spline (https://www.mathworks.com/matlabcentral/fileexchange/30288-h-infinity-optimal-causal-iir-inverse-filter-for-the-cubic-spline), MATLAB Central File Exchange. Retrieved .
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