butterFilter {NADfinder} | R Documentation |
The Butterworth filter is a type of signal processing filter designed to have as flat a frequency response as possible in the passband.
butterFilter(ratios, N = ceiling(length(ratios)/200))
ratios |
A vector of numeric. It is log2-transformed ratios, CPMRatios or OddRatios in each window. |
N |
numeric(1) or integer(1). Critical frequencies of the low pass filter will be set as 1/N. 1/N is a cutoff at 1/N-th of the Nyquist frequency. By default, it is suppose there are about 200 peaks in the inputs. |
A vector of numeric with same length of input ratios. The vector indicates smoothed ratios.
ratios <- runif(20000) butterFilter(ratios)