How to use harmonic fitting method
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Hi,
Please, how can I use Harmonic fiting for the attached data to get a smooth fit.
5 个评论
Torsten
2023-9-20
Where are the values of the variable you want to plot the data against (time or whatever) ?
TTA
2023-9-20
@TTA, Like this?
y = load('darta1.txt');
x = linspace(10, 60, numel(y));
plot(x, y, 'linewidth', 1.5), grid on
xlabel('x'), ylabel('y')
TTA
2023-9-20
yes but I want use harmonics to fit it to something like the attached figure
Torsten
2023-9-20
Tell us precisely what you define as your approximating "harmonic".
采纳的回答
I'm interpreting your 'Harmonic' model as the 'Sum of Sine' model. If this is not the case, then you will need to create a custom nonlinear model that suits the name "Harmonic" using the fittype() function.
y = load('darta1.txt');
x = linspace(10, 60, numel(y));
[f, gof] = fit(x', y, 'sin3')
plot(f, x, y), grid on,
legend('data', 'Sum of Sine (type-3)', 'location', 'best')
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