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Re: Fit data with range

  • To: mathgroup at smc.vnet.net
  • Subject: [mg88411] Re: [mg88364] Fit data with range
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Mon, 5 May 2008 06:09:57 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

data = Table[{x, x^2 - 11 x + 24 + 6 RandomReal[]}, {x, 0, 10, .25}];

pltRng = {{0, 10}, 1.2 {Min[data[[All, 2]]], Max[data[[All, 2]]]}};

fit = Fit[data, {1, x, x^2}, x]

xmin = 4; xmax = 7;

fit2 = Fit[Select[data, xmin <= #[[1]] <= xmax &], {1, x, x^2}, x]

Plot[{fit, fit2}, {x, 0, 10},
 PlotStyle -> {Green, Blue},
 Epilog -> {Red, Point[data]},
 PlotRange -> pltRng]


Bob Hanlon

---- Ivan <darknails at gmail.com> wrote: 
> Hi
> 
> I want to fit a polynomial function to a set of data,
> only between say xmin to xmax. How can I do that?
> I know only how to fit the whole range.
> 
> For example:
> 
> data = ReadList["file.dat",{Number,Number}];
> 
> fit = Fit[data,{1,x,x^2},x]
> 
> Plot[fit,{x,0,10}]
> 
> 
> 
> thanks!
> 



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