Applies a low-pass Butterworth filter recursively
ButterworthFilter(x, tau = 200)
A numeric vector giving the elements in the series
A numeric that determines the time constant of the filter, in units of the steps in the input time series.
See the description in"ProcessingAlgorithms.pdf". Do not use this function; it is for testing historical processing of RAF data files, but there is an error that causes an offset in the filtered values. Use signal::butter instead. Missing values are skipped in the recursive filter and are replicated in the output.
The filtered numeric series
## Not run: xf <- ButterworthFilter (x, tau)
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