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boykomet1-Visitor
1-Visitor
February 16, 2015
Question

How to interpolate (best-fit) a cloud of 3D points with a smooth 3D Surface?

  • February 16, 2015
  • 1 reply
  • 3762 views


It looks like Mathcad cannot do it.

1 reply

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Werner_E25-Diamond I
25-Diamond I
February 17, 2015

There are no built-in commands like expfit, logfit or genfit which you may know from the 2D case, but you sure can make a fitting surface of a specific type using a solveblock with minnerr().

BTW interpolation is not fitting.

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boykomet1-VisitorAuthor
1-Visitor
February 17, 2015

Hi Warner, Thank you for your help. In fact it is not a real clod of points. The points are series each one in a separate X-plane. In other words first each X-series point could be represent by a spline curve in YZ-plane (similar to spline-connected 2D plots in YZ-plane) and then those spline curves can be connected to represent a smooth 3D surface ( each XY-coordinate has a unique Z-coordinate on the surface ). Is that possible with Mathcad?

BTW do you use "fitting" in graph terminology when the points belong to the surface (line in 2D)? - If so, then fitting is the right term for what I want to do.

Thanks again

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