       Re: Fit or Interpolate

• To: mathgroup at smc.vnet.net
• Subject: [mg39219] Re: Fit or Interpolate
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Tue, 4 Feb 2003 02:21:38 -0500 (EST)
• Organization: Universitaet Leipzig
• References: <b1l24l\$ib5\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Hi,

a interpolation gives for the data x[i], y[i] at every
point x[i] the original y[i], a fit must not do that.

Regards
Jens

David Seruyange wrote:
>
> Hello all,
>
> Another in a series of potentially simple questions:
>
> What is the difference between using Fit and Interpolation?
> f[x_]=Fit[data, {1,x},x]
> -or-
> f[x_]=Interpolation[data][x]
>
> I do know that Fit can take arguments for the independant variables
> form like:
> f[x_]=Fit[data, {1,x},x]
> f[x_]=Fit[data, {1,x,x^2},x]
> but that's a bit of guesswork if you have a limited set of points, no?
>
> Also, is there a function in Mathematica that allows me to swap
> dependent and independent variables? e.g. x=2.5y --> y=x/2.5
>
> Thanks much,
>
> David Seruyange
> Student

```

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