http://en.wikipedia.org/wiki/Curve_fitting

"Stephen" <mcavoysAT@aolDOTcom> wrote in message 
news:594t44hfs6cuejciibnd0vrnkve4q303jl@4ax.com...
> Does anyone know of free software :) that will give me an 
> equation
> from a set of data points?
> I've been using Excel's trendline but the equation it returns
> sometimes fits but often is way out. I've got a series of 
> translations
> and rotations from PoserPhysics that I want to convert into some
> equations so I can replicate them in Bishop3D. (Bishop3D does not 
> have
> the function to load an input file, yet. It does have the ability 
> to
> create the points from a polynomial equation) I'll copy a short
> extract below. Excel gives good results up to Frame #22 then 
> gives
> nothing useful afterwards. I've been splitting the data into 
> sections.
> Of course maybe I'm not very good with excel.
>
> Frame Yposition
> 0 3.4884
> 1 3.4822
> 2 3.4652
> 3 3.4373
> 4 3.3984
> 5 3.3487
> 6 3.2881
> 7 3.2166
> 8 3.1341
> 9 3.0408
> 10 2.9366
> 11 2.8214
> 12 2.6954
> 13 2.5585
> 14 2.4106
> 15 2.2519
> 16 2.0823
> 17 1.9017
> 18 1.7103
> 19 1.508
> 20 1.2947
> 21 1.0706
> 22 0.83559
> 23 0.78687
> 24 0.94375
> 25 0.96928
> 26 0.84659
> 27 0.7397
> 28 0.77747
> 29 0.88383
> 30 0.99821
> 31 1.0788
> 32 1.1167
> 33 1.1143
> 34 1.0975
> 35 1.0687
> 36 1.028
> 37 0.97593
> 38 0.91267
> 39 0.83864
> 40 0.7542
> 41 0.75308
> 42 0.75202
> 43 0.71815
> 44 0.66709
> 45 0.60173
> 46 0.53591
> 47 0.49003
> 48 0.48278
> 49 0.51193
> 50 0.5476
>
> -- 
>
> Regards
>     Stephen

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