# LowpassFilter and LeastSquaresFilterKernel implementation

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 LeastSquaresFilterKernel?

• Have you tried asking Wolfram Support? Unless it is in the documentation, they would be the most reliable source for this kind of information. – MarcoB Aug 9 '17 at 15:47
• No, but I will try for sure. How do you contact them? – RTisseur Aug 10 '17 at 16:30
• You can use this form. – MarcoB Aug 11 '17 at 4:32
• If they respond, you can then answer your question yourself. – J. M. will be back soon Aug 11 '17 at 16:31