topic BSpline in Mathcad

BSpline

awibroe — Tue, 17 Jul 2018 01:56:29 GMT

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

Re: BSpline

ViktorKorobov — Fri, 15 Jun 2018 12:02:20 GMT

Maybe this will help:

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

Re: BSpline

DJF — Fri, 15 Jun 2018 13:09:58 GMT

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.

Re: BSpline

awibroe — Fri, 15 Jun 2018 18:49:15 GMT

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

Re: BSpline

DJF — Fri, 15 Jun 2018 21:18:34 GMT

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.