butfilt {RSEIS} | R Documentation |
design and apply butterworth low/high/band pass filters.
butfilt(a, fl, fh, deltat, type, proto)
a |
vector signal |
fl |
low frequency cut-off |
fh |
high frequency cut-off |
deltat |
sample rate, s |
type |
type of filter, one of c("LP", "HP","BP" ,"BR" ) |
proto |
prototype, c("BU", "BE" , "C1" ,"C2") |
creation of butfilt is a described by the following arguments:
filtered time series
Jonathan M. Lees<jonathan.lees.edu>
data(CE1) ts1 = CE1$y zz = butfilt(ts1, 1, 15, CE1$dt, "LP" , "BU")