Summary
The end conditions for cubic spline interpolation with equidistant knots will be defined so as to make the (slightly modified) B-spline coefficients minimal. This produces good approximation results as compared e.g. with the not-a-knot spline.
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László, L. Cubic spline interpolation with quasiminimal B-spline coefficients. Acta Math Hung 107, 77–87 (2005). https://doi.org/10.1007/s10474-005-0180-4
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DOI: https://doi.org/10.1007/s10474-005-0180-4