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MathGroup Archive 2005

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Re: Nonlinear Curve Fitting

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53847] Re: Nonlinear Curve Fitting
  • From: "Ray Koopman" <koopman at sfu.ca>
  • Date: Sat, 29 Jan 2005 06:03:01 -0500 (EST)
  • References: <ctcrit$6pu$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

nilaakash wrote:
> Dear Friends,
>               I have tried to fit a nonlinear curve, but failed. I am
> giving my points and it's curve equation is
>
>     \!\(y = a \((1 - x\/c)\)\^b\)
>
> Here a, b, c are fit parameters. My initial guess is like
>    a =   0.3
>    b =   0.2
>    c = 385.2
>
> data={{...}}

r = FindFit[data, a(1-x/c)^b, {{a,.3},{b,.2},{c,385.2}}, x]

{a->0.318854,b->0.204693,c->384.614}

Plot[Evaluate[a(1-x/c)^b/.r],{x,326,382},Prolog->Point/@data];
Looks good to me.


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