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  • $\begingroup$ I have still not clue which package you use and I have the strong feeling that most (if not all) other users are in the same position... $\endgroup$ Commented Feb 4, 2019 at 20:08
  • $\begingroup$ Possible duplicate of Savitzky-Golay Filter to smooth noisy data $\endgroup$ Commented Feb 4, 2019 at 20:10
  • $\begingroup$ I guess i don't know how to frame the question.Ignore the package part. I already know how to apply filters and just want to know how to get derivative. What i'm basically asking is what's the approach to take in applying Savitzky–Golay method to find the first derivative. $\endgroup$ Commented Feb 4, 2019 at 20:12
  • 3
    $\begingroup$ @Maine Please add a minimal example to your question - copy-pasteable code that will work on any given computer - or we simply won't be able to help you. $\endgroup$ Commented Feb 4, 2019 at 20:53