Generate fitting curve from timetable plot

Question

Roger Gomila 2020-3-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513843-generate-fitting-curve-from-timetable-plot

评论： Hiro Yoshino 2020-3-30

采纳的回答： Hiro Yoshino

table.mat

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

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David Wilson 2020-3-30

So when you say above " would like tot (sic) fit a line over these points", you really mean a smooth curve that runs through the data cloud?

Do you have the curvefitting toolbox or the optimisation toolbox?

If not, then you have made more work for yourself, but you can always follow:

https://au.mathworks.com/help/matlab/math/example-curve-fitting-via-optimization.html

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Answer 1

Hiro Yoshino 2020-3-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513843-generate-fitting-curve-from-timetable-plot#answer_422754

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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Roger Gomila 2020-3-30

在 MATLAB Online 中打开

Thanks, it worked now! But I have another trouble. I am trying to plot two different lines in the same figure, but I can't change the colors of the lines. Do you know how to do it?

% Plot fit with data.
figure( 'Name', 'B3 and B4' );
hold on
plot( fitresult{1}, xData_B3, yData_B3,'Color',[0.87451 0.11765 0.15]);     % Color is not working
plot( fitresult{2}, xData_B4, yData_B4,'Color',[0.98431 0.63921 0.102]);

Thanks

Hiro Yoshino 2020-3-30

在 MATLAB Online 中打开

figure( 'Name', 'B3 and B4' );
hold on;
plot(fitresult{1}, 'b');
plot(xData_B3, yData_B3, 'bo');
plot(fitresult{2}, 'r');
plot(xData_B4, yData_B4, 'ro');
hold off;