RSEIS (version 2.6-0)

butfilt: Butterworth filter

Description

design and apply butterworth low/high/band pass filters.

Usage

butfilt(a, fl=0, fh=0.5, deltat=1, type="BP", proto="BU", npoles=5, chebstop=30.0, trbndw=0.3)

Value

• filtered time series

Details

creation of butfilt is a described by the following arguments: [object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Arguments chebstop , trbndw are ignored for non-chebyshev filters. LP and HP filters are seet by specifying fl for HP filters and fh for LP filters, the other argumentin each case is ignored.

Examples

data(CE1)

ts1 = CE1$y
zz = butfilt(ts1, 1, 15,  CE1$dt, "LP" ,  "BU")