Can anyone help me how to remove the drift (long duration) from the cyclic data as below? If you have a function for this one, it will be greatly appreciated.
Regards
Essentially you need a (digital) high-pass filter, something like:
This filter takes X as the input data (array) and tau as a suitably chosen constant. In your case you'll have to try out what gives you best results.
To show its operation, suppose this is your input data:
Then filtering does this:
Success!
Luc
