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dpb
Posts:
6,677
Registered:
6/7/07
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Re: Polyfit data
Posted:
Feb 23, 2013 9:01 PM
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On 2/23/2013 1:42 PM, Ryan Pelky wrote:
> I have a set of data which is 19 rows by 2 columns. I'm trying to run a
> for loop to plot polyfit lines of different orders (1:7) here is what I
> came up with.
> %polyfit problem
> clear;clc;
> load('dota.mat')
>
> x=1:.01:20;
> for(i=1:7)
> coef=polyfit(dota(:,1),dota(:,2),i)
> yfit=coef(i+1)+coef(i)*x.^i;
...
A seventh order polynomial is likely to be highly noisy for real data
but above may be only for tutorial purposes...
They're aren't enough coefficients for a fixed evaluation as above and
you'll have wiped out the coef() array w/ a new order the second and
subsequent times thru, anyway...
doc polyval
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