Re: curve fitting

Hoyt,

Your message reminds me: Elisabeth Beichl? at NIST published a paper
on "A simplified method of Stepwise linear approximation for
arbitrary curves" (paraphrased from memory; and there was a co-
author). Might be worth looking at?

Hope this helps,

Ballendo

--- In CAD_CAM_EDM_DRO@y..., batwings@i... wrote:
> Fred:
>
> It feels to me like a lot of work ... you can make the curve thru
current
> fitting methods, but the more points in your data set, the more
terms in
> your equation of solution. I can probe out in ten minutes waymore
enough
> points to require hundreds of terms in the equation. So now as
software
> writer you have to program the method of generating the equation in
> computational memory space, no small task with big data sets. Then
you have
> to evaluate the equation for each increment of X or Y (one vs the
other
> depending on instant slope of tangent) and then you write the
output to the
> machine as lines or arcs anyway. For all that you get maybe a few %
more
> precision around your curve.
>
> OTOH, stepwise arc method is simple in concept and code, easy on
CPU hence
> fast, and results in essentially the same thing at work. What am I
missing?
>
> Regards, Hoyt
>
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