emuR (version 2.4.0)

dextract: Extract a subset of data from a trackdata object

Description

A function that cuts up trackdata either at a proportional time or proportionally between two times. It is a subsidiary function of dplot()

Usage

dextract(dataset, start, end)

Value

If both start and end are specified, a trackdata object is returned, otherwise a vector if the original trackdata is one-dimensional and the end argument is not used, or a matrix if the original trackdata has more than one dimension and the end argument is not used

Arguments

dataset

A trackdata object

start

A single valued numeric vector corresponding to a proportional time between zero (the onset of the trackdata) and one (the offset of the trackdata).

end

As start, but optional

Author

Jonathan Harrington

See Also

dcut

Examples

data(demo.vowels.f0)
data(demo.vowels.fm)

form = demo.vowels.fm
# get the formants at the midpoint: f50 is a matrix
# same as dcut(form, .5, prop=TRUE)
f50 = dextract(form, 0.5)
# get the formants between the 25% and 75% time points
# fcut is a trackdata object
# same as dcut(form, .25, .75, prop=TRUE)
fcut = dextract(form, 0.25, 0.75)
# get  F0 at the midpoint. fzero50 is a vector
# same as dcut(fzero, .5, prop=TRUE)
fzero = demo.vowels.f0
fzero50 = dextract(fzero, 0.5)