Are there shape preserving (ensuring properties such as convexity, monotonicity, positivity) splines (such as bi-cubic polynomial) in 2 or more dimensions for fitting data in either $l^2$ or $l^1$ norm? It would be great if the objective function for minimizing error is convex.
2026-03-27 16:24:45.1774628685
Bivariate shape preserving spline
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