MATLAB: How to extract the function from curve fitting tool in Matlab

curve fittinginterpolationMATLABnumerical integration

I want to extract the function for my data points. I used interpolant witg linear method as indicated in the figure below.

Is it possible to extract a function for the new curve produced by curve fitting as i want to integrate the equation to get the area under the curve?

Best Answer

You can call integrate on the cfit object. See the documentation page for more information.

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Yes. There is LSCOV.

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You could certainly write your own function by using the gof output of the "fit" function.

Here is an example that shows you how to use the "fit" to see the Goodness of Fit of different methods. You could store the "gof" values in an array and find the max GoF.

function bestFitName = Gof_Finder( x, y )
    Fits = {'poly1', 'poly2', 'poly3', 'exp1'};
      for i=1:numel(Fits)
          [~,GoFs(i)] = fit( x, y,  Fits{i} );
      end
      [~, minIdx] = min([GoFs.sse]);
      bestFitName = Fits{minIdx};
  end

The above function will return the name of the best fit of the data x and y.

Best Answer

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MATLAB: Weighted least square fit

MATLAB: Matlab curve fitting tool automation for selection of fit with minimum sse.

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