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Re: Curve Fitting w/ Parametric Equations

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

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

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

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

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

-mark e. harder

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

>  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.

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