Fitting the data without using curve fitting tool

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shaina dhamija
shaina dhamija 2019-11-21
评论： Matt J 2020-12-16
Hi. I have a matrix and I have been using the following syntax to fit some data from the matrix z.
[~,~,output] = fit(t,z(:,32),'poly3');
p= output.residuals
The output residuals get stored as output.residuals in the workspace and have to be extracted.
I wish to do the fitting for all the columns in the matrix and use the residuals for all columns in a loop. I wish to put the fitting syntax directly in the loop and not extract output residuals since the loop doesn't run.
  1 个评论
Matt J
Matt J 2020-12-16
sagi moshe lifshitz's comment moved here:
I have a follow-up question:
I also used the fit() function (on 2017a):
[ fitobject, gof, output ] = fit( [x, y], z, 'poly11' );
plot( fitobject, [x, y], z );
Now in 2020b it isn't working,
The defult function is fit() from machine.learning.toolbox (https://www.mathworks.com/help/stats/lime.fit.html),
and not the regular fit() from curve.fitting.toolbox (https://www.mathworks.com/help/curvefit/fit.html).
The only way to use it is to buy the toolbox? :(

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回答（1 个）

KSSV
KSSV 2019-11-21
YOu can use polyfit.
p = polyfit(t,z(:,32),3) ;
zi = polyval(p,t) ;

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