Re: polyfit problem?

[ldoolitt]

Hi -
 
> When I use octave to get a 9th degree polynomial for xy below, via
> polyfit I get very strange coefficients, while when I use gnuplot's fit
> capability on the same data I get reasonable coefficients.

octave's polyfit does no pre-scaling before setting up the matrix.
I find that necessary for any kind of real work with polynomial fits.
When I ran into this, I prescaled the data before calling polyfit,
rather than "fixing" polyfit.  Sorry.

     - Larry