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A
awibroe1-Visitor
1-Visitor
June 14, 2018
Question

BSpline

  • June 14, 2018
  • 2 replies
  • 3184 views

Hi All,

 

I am desperately trying to get my head around the Bspline function and associated functions like Spline2 but the help files leave allot to the imagination. I need a bit of a demo. Anyone got a worksheet (that would work in MCP3) that I can look at to get an idea of how the functions work specifically in terms of plotting data?

 

Thanks,

 

Andy

2 replies

V
ViktorKorobov1-Visitor
1-Visitor
June 15, 2018

Maybe this will help:

https://www.researchgate.net/publication/236623933_Teaching_spline_functions_with_Mathcad

D
DJF16-Pearl
16-Pearl
June 15, 2018

This is basically straight from the help files, but boiled down some.  And the key part to make it useful is fitting the b-spline with a cubic so we can pull values at any point.

 

2018-06-15_8-03-48.jpg

A
awibroe1-VisitorAuthor
1-Visitor
June 15, 2018
One thing I’m not clear on is what is weighting in this context and how is it defined?
D
DJF16-Pearl
16-Pearl
June 15, 2018

Weighting just gives more weight to some points as opposed to others, which will affect the fit accordingly.  Other than this example I never use it.  You likely don't need it either.   You just need to delete the 'w' in the b= equation to ignore it.

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