Sum of sines optimized starting points

Dear community,

Matlab uses optimized starting points to fit a sum of sines model to data in the Curve Fitting Toolbox.

Does somebody know the algorithm MATLAB uses to determine the starting points? I have a slightly different sines model, but the optimized starting points are not available for custom equations.

Best regards,

Answer 1

[Torsten]

https://uk.mathworks.com/matlabcentral/answers/511413-curve-fitting-tool-starting-points

If your problem is linear in the fitting parameters (which is usually the case for a sum of sines), you don't need initial values for the parameters. You can directly determine the parameters in one step by solving an overdetermined linear system of equations.