My situation is similar to having a Cos and Sin functions that would combine to the profile of the envelope but the envelope is offset horizontally by some dt.
It would be something like aCos(t+dt)+ bSin(t+dt)=Envelope(t), I want to find the coefficients and the time shift {a,b,dt}.
I have 2 data sets(lists) for the two input data sets and the data set for the envelope. How can I fit this? Using a NonLinearModelFit cannot fit this many functions at once.
