I'm in the troublesome phase to port Mathematica code into another programming language. I cannot find a proper reference on the algorithm used in the
LeastSquaresFilterKernel function of Mathematica. This last function is used by
LowpassFilter as shown in the examples, despite the fact that I have tried with my signal and it does not work in the same way.
Can anyone help me in finding the detailed implementation of
LowpassFilter or some reference for