Your English is quite satisfactory.
It is best to start a new thread rather than appending to an older one. Although the topics are related your question is somewhat different from this thread. It can be useful to mention that you have looked at this thread, so people do not send you to something you have already checked.
In your new thread please be as specific as possible about the analysis you are trying to do. Most of us are not EMG experts but may know about regression or filters. How do you define R1 and R2? Are the segments manually selected bu a user or do they need to be detected automatically by the software? You say that you tried several things but "none of them have resulted." Does that mean that the program returned no results or that the results were not what you expected?
Regression, median filter, and Savitsky-Golay are quite different processes. What kind of processing is reported in in the literature in your field for what you want to do?
Please post one of your files (if they are not too large) and tell us what the data in it should produce.
Lynn
