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Brilliant package Bruno. Quick question.
I know you can fix any given knot, but is it possible to fix a given not to a y-value but let the least squares find the best x-value for it?
I'm using 4 knots/3 lines to represent my data but I would always like the 3rd knot to have y=0. While this condition is met some of the time (by chance) ideally I would like to enforce it.