dextract {emuR}

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)

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

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

Author(s)

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)