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BSpline

awibroe
14-Alexandrite

BSpline

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

4 REPLIES 4
ViktorKorobov
13-Aquamarine
(To:awibroe)
DJF
15-Moonstone
15-Moonstone
(To:awibroe)

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

awibroe
14-Alexandrite
(To:DJF)

One thing I’m not clear on is what is weighting in this context and how is it defined?
DJF
15-Moonstone
15-Moonstone
(To:awibroe)

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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