CODEWITHSUNDEEP
matlabcurve-fitting
Josh
Josh

Reputation: 768

Centering and scaling data using the polyfit function in Matlab

So I have a long list of data and for my project and I need to find a line of best fit for it. My professor has recommended centering and scaling the data using [p,S,mu] = polyfit(x,n). But then when I compute the best fit line, I should be using this new data. How do I access this data? Matlab's help says that it uses a formula taking (x- mu1)/mu2. So to use the corrected x values I would just need to replace the x in yfit1 = polyval(coef1,x); with (x-mu(1)/mu(2))?

Upvotes: 3

Views: 4299

Answers (1)

dustincarr
dustincarr

Reputation: 1415

Yes, that is correct. Replace 

yfit1 = polyval(coef1,x);

with 

yfit1 = polyval(coef1,(x-mu(1))/mu(2));

Upvotes: 3

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