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Clamped cubic spline
I am making a shape by getting Mathematica to draw a smooth curve through a set of points. I want to set the slope of the curve at the endpoints. The slope at the endpoints will either be vertical or horizontal. I understand that a clamped cubic spline should be able to do this. The SplineFit package doesn't have clamped cubic splines. There is an old MathSource package which I couldn't get to work. Any help would be appreciated.