MATLAB: Generate fitting curve from timetable plot

curve fittingMATLABplotting

I have this table with percentatge values over time. When I do a scatter plot i get the following:

I would like tot fit a line over these points so that it show like this:

I know probably is easy to do, but I amb quite new to matlab programming and I've been wasting a couple of hours trying to do it but I am just getting different errors for each new method I try. I just could plot a linear regression, which I didn't want because it does not fit the plot shape.

Thank you in advance

Best Answer

Curve fitting app would suit you.

https://jp.mathworks.com/help/curvefit/interactive-curve-and-surface-fitting-.html

You can play around the various methods built in MATLAB.

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MATLAB: Substract fitted values from original data

First, eval is evil; avoid it as much as possible: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval . Also, in your case, there is no need, you can directly evaluate fitresult

y_predictions = fitresult(xData)

For the issue in your question. This seems to be a bug in the implementation of fit() function (unless I am overlooking something). For some reason, the fitresult does not report the coefficient value correctly. The issue resolves if you don't pass the opts structure to fit()

[fitresult, ~] = fit(xData, yData, ft);

You may consider filing a bug report: https://www.mathworks.com/support/bugreports/report_bug

MATLAB: How to plot a fit object without extrapolation

You can pass 'XLim' into fitresult's plot to plot only over a specific range in x.

http://www.mathworks.com/help/releases/R2014a/curvefit/plot.html

Best Answer

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