MATLAB Answers

Generate fitting curve from timetable plot

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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

  1 Comment

David Wilson
David Wilson on 30 Mar 2020
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:

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Accepted Answer

Hiro Yoshino
Hiro Yoshino on 30 Mar 2020
Curve fitting app would suit you.
You can play around the various methods built in MATLAB.

  2 Comments

Roger Gomila
Roger Gomila on 30 Mar 2020
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
Hiro Yoshino on 30 Mar 2020
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;
Try this!?

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