how to find the slope at a certain point of linear splines or cubic splines?

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Mathidiot Superfacial 2016-1-8

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编辑： Walter Roberson 2016-1-8

how to find the slope at a certain point of linear splines or cubic splines?

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Walter Roberson 2016-1-8

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编辑：Walter Roberson 2016-1-8

http://www.mathworks.com/matlabcentral/answers/95194-how-do-i-find-the-derivative-of-a-spline-curve-in-matlab-7-9-r2009b

And http://www.mathworks.com/matlabcentral/fileexchange/13812-splinefit for ppdiff.m

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