The calculations was a bit work, signal.pdf gave next to no hints about what values W should have, but the original octave documentation at least mentioned radians which got me going. Update 2: Using the Butterworth filter in the signal package suggested I get the following: Points(x, y + noise1, col="green", pch=20) Update: The graph was generated with number_of_cycles = 2 approximately the red/yellow graphs) using a low pass/ high pass filter? How do I extract the low/high frequencies (i.e. But let's say that I only have the data points of something like the green graph. The green graph in the picture is composed by the red and yellow graphs. I am a beginner in R and I have tried to find information about the following without finding anything.
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