Curve fitting - periodic function

Hi,

I would like to fit a curve to a set of data (I know the function is periodic). The problem is, all the fittings I tried are unable to reproduced the periodicity of the function.

Is there any way to use the curve fitting toolbox to fit a periodic function data set using only 1 period?

Thank you, Alex

Answer 1

[Richard Willey]

Here's a pretty basic example

X = linspace(0, 2*pi, 100);
X = X';
Y = sin(X) + randn(100,1);

foo = fit(X,Y, 'sin1')

scatter(X,Y);
hold on
plot(foo)

[Alexandre]

Thank you very much, this was exactly what I was looking for!

Answer 2

[Andrew Newell]

You could try selecting "Sum of sin functions" for the type of fit.