Fitting f(x) = sin(x)*sin(x) with LinearCombinationFunc()

@Mantas_Vitkus wrote:

I am trying to fit f(x) = sin(x)*sin(x) function to my data like this:

Func<double, double> fit = Fit.LinearCombinationFunc(
    xData,
    yData,
    x => 1.0,                
    x => Math.Pow(Math.Sin(x + 1.0), 2));

But the phase of “fit” is a bit off:

krYX5.png1017×546 27.2 KB

My data could have random phase shift every time a acquire it and that is the main problem with this fitting.
What I am doing wrong?

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