astrochron (version 0.4.3)

taner: Apply Taner Bandpass or Lowpass Filter to Stratigraphic Series

Description

Apply Taner bandpass or lowpass filter to stratigraphic series.

Usage

taner(dat,padfac=2,flow=NULL,fhigh=NULL,roll=10^3,demean=T,detrend=F,addmean=T,
       output=1,xmin=0,xmax=Nyq,genplot=T,verbose=T)

Arguments

dat

Stratigraphic series for bandpass 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.

flow

Lowest frequency cut-off (half power point). If this value is not set (NULL), it will default to -1*fhigh, which will create a lowpass filter.

fhigh

Highest frequency cut-off (half power point).

roll

Roll-off rate, in dB/octave. Typical values are 10^3 to 10^12, but can be larger.

demean

Remove mean from data series? (T or F)

detrend

Remove linear trend from data series? (T or F)

addmean

Add mean value to bandpass result? (T or F)

output

Output: (1) filtered series, (2) bandpass filter window.

xmin

Smallest frequency for plotting.

xmax

Largest frequency for plotting.

genplot

Generate summary plots? (T or F)

verbose

Verbose output? (T or F)

Value

• bandpassed stratigraphic series.

References

http://www.rocksolidimages.com/pdf/attrib_revisited.htm#_Toc328470897

See Also

bandpass, lowpass, noKernel, noLow, prewhiteAR, and prewhiteAR1

Examples

# generate example series with 3 precession terms and noise
ex <- cycles(noisevar=.0004,dt=5)
# bandpass precession terms using Taner window 
res_ex <- taner(ex,flow=0.038,fhigh=0.057)

# generate example series with periods of 405 ka, 100 ka and 20 ka, plus noise
ex2=cycles(freqs=c(1/405,1/100,1/20),noisevar=.1,dt=5)
# lowpass filter using Taner window
res_ex2=taner(ex2,fhigh=.02,roll=10^4)