What methods are performed for regression with trigonometric functions? E.g. :
Sequence: $$-1, 0, 1, -1, 0, 1, \ldots$$ Regression: $$\frac{2\sqrt3}{3}\;\cos\left(\frac{2\pi n}{3} + \frac{\pi}{6}\right)$$
2026-03-26 20:41:05.1774557665
What methods are performed for regression with trig functions? Eg, $-1,0,1,-1,0,1,\ldots$ to $\frac{2\sqrt3}{3}\cos(\frac{2\pi n}{3}+\frac{\pi}{6})$
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If I properly understand your question, you have a list of data points$(x_i,y_i)$ and you want to fit a model looking like $$y=a \cos(b x+c)$$ This is relevant from nonlinear regression and it should not make any specific problem if you are able to generate "reasonable" starting values.
By the way, this is sequence $A049347$ at $OEIS$.