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Cubic Splines lpc [dspline, fintegrate]
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In this Smath document, InterpSpline(s,X,Y,t) is equivalent to Mathcad linterp(s,X,Y,t), pinterp(s,X,Y,t), cinterp(s,X,Y,t) except that in Smath you have to pre-assign the 's' spline type. 1. It supports the scalar plot on canvas, in-situ interpolation. 2. It supports the scalar 'dspline' up to 3rd derivative. 3. It supports the discrete cumulative integral, from which you can extract value(s) from "row(,,)" 4. Of great interest, observe the 2nd order discrete derivative Deriv2=augment(X,s) Enjoy, best use, comments appreciated ... thanks. Jean  Spline l_p_c [dspline, fintegrate].sm (71kb) downloaded 33 time(s).
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 1 user thanked Jean Giraud for this useful post.
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Rank: Guest
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Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)
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... refactored a bit to be more generalised. The graet cruncher is the tridiagonal solver. I have no idea if it could be accelerated. Cheers, Jean Spline l_p_c [dspline, fintegrate].sm (72kb) downloaded 34 time(s).
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2 users thanked Jean Giraud for this useful post.
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on 16/09/2016(UTC), on 16/09/2016(UTC)
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