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MathGroup Archive 2000

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Re: Using output of a Fit

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24909] Re: [mg24895] Using output of a Fit
  • From: BobHanlon at aol.com
  • Date: Sun, 20 Aug 2000 01:34:57 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 8/19/2000 4:58:26 AM, owenzooey at my-deja.com writes:

>I've used
>
>Fit[data,{1,x},x]
>
>to determine a best-fit line.
>
>How can I automatically send the output of Fit to be evaluated using
>different values of x?
>

Use Fit in the definition of a function then use the function as you would 
any other function.

data = Table[7*x + 3 + 10*Random[], {x, 10}];

f[x_] := Evaluate[Fit[data, {1, x}, x]]

Needs["Graphics`Graphics`"]

DisplayTogether[
    ListPlot[data, PlotStyle -> {AbsolutePointSize[3], RGBColor[1, 0, 0]}], 
    Plot[f[x], {x, 0, 10}, PlotStyle -> RGBColor[0, 0, 1]]];


Bob Hanlon


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