       Re: Curve Fitting w/ Parametric Equations

• To: mathgroup at smc.vnet.net
• Subject: [mg16941] Re: [mg16905] Curve Fitting w/ Parametric Equations
• From: "Mark E. Harder" <harderm at ucs.orst.edu>
• Date: Thu, 8 Apr 1999 02:32:42 -0400
• Sender: owner-wri-mathgroup at wolfram.com

```Fu-Lin --
I did the following, fitting parametric eqns. for x & y to data with
noise in y.  Each variable (x, & y) is fitted separately. Is this what you
wanted?

data= Table[{ 2t, 5 t^2+Random[Real,{- t,+t},3] },{t,0,5,.1} ];
ListPlot[data];

tVec=Table[t,{t,0.,5.,.1} ];
fitData=Table[{tVec[[i]],data[[i,j]]},{j,1,2},{i,1,51} ];
x=Fit[fitData[],{t},t ]
y=Fit[fitData[],{t^2},t ]

Show[ListPlot[data ], ParametricPlot[{x, y}, {t, 0., 5.}] ];

-mark e. harder

-----Original Message-----
From: Fu-Lin Tsung <flt at apk.net>
To: mathgroup at smc.vnet.net
Subject: [mg16941] [mg16905] Curve Fitting w/ Parametric Equations

>Hi,
>
>  I'd like to do curve fits using parametric equations. Is this possible?
>Looking at an older manual (Mathematica-Wolfram, 2nd edition) I don't
>think it is. I'm new to mathematica and am wondering if there are any
>tricks/tips I can use to accomplish this task?
>
>Thanks for any and all tips and suggestions.
>
>flt
>

```

• Prev by Date: Matrix manipulation
• Next by Date: Re: Help needed with List!
• Previous by thread: Curve Fitting w/ Parametric Equations
• Next by thread: ContourPlot: non-rectangular domains?