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>*Reply-to*: kuska at informatik.uni-leipzig.de*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