Dear Soeren Groettrup,


Re:


> I am dealing with a time series of eeg data and I need to filter them with a notch filter. However, I could only find the function notch() in the RTisean package. Unfortunately, this function is not implemented yet. Is there another package/function in R which performs such a filtering?



The 'signal' package contains many filter functions, such as Butterworth:

butter(n, W, type = c("low", "high", "stop", "pass"), 

The "stop" version is probably what you are looking for. 
As in a band pass filter, the upper and lower frequencies must be given, as fraction of the sample frequency (so W is a vector with two values).
Hope this helps,With best wishes,

Franklin
--




Dr. Franklin Bretschneider
Dept of Biology
Utrecht Unversity
Padualaan 8
3584 CH  Utrecht
The Netherlands
f.bretschneider@uu.nl



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