Smoothing cubic splines are implemented with periodic conditions, so that closed curves in any dimension can be approximated. It includes a test function to demonstrate it.
Theoretical arguments supporting this implementation can be found here:
Massimo Zanetti (2021). Smoothing Cubic Splines with periodic conditions (https://www.mathworks.com/matlabcentral/fileexchange/59463-smoothing-cubic-splines-with-periodic-conditions), MATLAB Central File Exchange. Retrieved .
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