Usage
lowpass(dat,padfac=2,fcut=NULL,win=0,demean=T,detrend=F,alpha=3,p=0.25,xmin=0,xmax=Nyq,
addmean=T,genplot=T,verbose=T)Arguments
dat
Stratigraphic series for lowpass filtering. First column should be location (e.g., depth), second column should be data value.
padfac
Pad with zeros to (padfac*npts) points, where npts is the original number of data points.
fcut
Cutoff frequency for lowpass filtering.
win
Window type for bandpass filter: 0 = rectangular , 1= Gaussian, 2= Cosine-tapered window.
demean
Remove mean from data series? (T or F)
detrend
Remove linear trend from data series? (T or F)
alpha
Gaussian window parameter: alpha is 1/stdev, a measure of the width of the Dirichlet kernal. Larger values decrease the width of data window, reduce discontinuities, and increase width of the transform. Choose alpha >= 2.5.
p
Cosine-tapered window parameter: p is the percent of the data series tapered (choose 0-1).
xmin
Smallest frequency for plotting.
xmax
Largest frequency for plotting.
addmean
Add mean value to bandpass result? (T or F)
genplot
Generate summary plots? (T or F)
verbose
Verbose output? (T or F)