BSpline

[awibroe]

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

[ViktorKorobov]

Maybe this will help:

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

[DJF]

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.

[awibroe]

One thing I’m not clear on is what is weighting in this context and how is it defined?

[DJF]

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.