Re: How to use BestFitParameters?

*To*: mathgroup at smc.vnet.net*Subject*: [mg24398] Re: How to use BestFitParameters?*From*: Lawrence Walker <lwalker701 at earthlink.net>*Date*: Wed, 12 Jul 2000 23:13:41 -0400 (EDT)*Organization*: Morgan State University: COMSARE*References*: <8k0v83$q8s@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hi Rob, Use option "RegressionReport -> BestFit" instead. Lawrence rob wrote: > p is a list of data pairs { {x1,y1}, {x2,y2}, ....} and when I fit > this data to a function Mathematica does a pretty good job of doing the fit: > > NonlinearRegress[p, a/Sqrt[d^2 + (x1 - w0)^2], {x1}, {a, d, w0}, > MaxIterations -> 200, RegressionReport -> BestFitParameters] > > gives this as an output: > {BestFitParameters -> {a -> 1.07061, d -> 0.300272, w0 -> 28.8068}} > > I know it is pretty a pretty good fit to the data because I can use > another program like Excel to plot the curve using these parameters > and display it next to the data. It sure would be nice to do this in > Mathematica without going to an outside program. I've tried things but I > can't seem to be able to get to the parameters a, d and w0. I can't > even list them. For example, I'd like to display the number > d/Sqrt[w0^2-d^2]. So I tried this: > > d/Sqrt[w0^2-d^2] /. % > > All I get is the formula in symbolic form. > > Can someone here provide some relief? > > Thanks, Rob -- ------------------------------------------------------------ (\___/) The fear of the LORD is the beginning of (o\ /o) wisdom: a good understanding have all they /|:.V.:|\ that do his commandments: his praise \\:::::// endureth for ever. Psa 111:10 -----`"" ""`------------------------------------------------ Lawrence A. Walker Jr., M.Eng./Ph.D. Candidate Morgan State University Clarence M. Mitchell School of Engineering COMSARE (Center Of Microwave/Satellite And RF Engineering) Rm: 306-Schafer Phone: (443)885-1453 ------------------------------------------------------------