emuR (version 0.1.8)

fapply: Function that applies a function to an EMU spectral object

Description

Applies a function to an EMU spectral object.

Usage

fapply(specdata, fun, ..., power = FALSE, powcoeffs = c(10, 10))

Arguments

specdata

A matrix or trackdata object of class spectral

fun

A function to be applied.

power

A single element logical vector. If T, convert specdata to power values i.e. apply the function to a * specdata $^$b or a * specdata\$data $^$b where a and b powcoeffs defined below.

powcoeffs

A 2 element numeric vector for converting dB values to power values. Defaults to a = 10 and b = 10. See power.

...

Optional arguments to fun

Value

If the output has the same dimensions has the input, then an object of the same dimensionality and class is returned. Otherwise it may be a vector or matrix depending on the function that is applied. ...

Warning

The function can be very slow if applied to a large trackdata object. In this case, it may be faster to use a for-loop with the desired function around \$data

Details

fapply performs a similar operation to apply except that it is specifically designed for handling EMU spectral objects.

See Also

apply by.trackdata

Examples

# mean value per spectrum, input is a spectral matrix
m <- fapply(vowlax.dft.5, sapply, FUN=mean)
# as above but after converting dB to powers before
# applying the function
m <- fapply(vowlax.dft.5, sapply, FUN=mean, power=TRUE)
# spectral range
r <- fapply(vowlax.dft.5, range)
# spectral moments applied to a trackdata object
# m is a four-dimensional trackdata object
m <- fapply(fric.dft, moments)
# 1st 3 DCT coefficients calculated in a spectral matrix
# d is a 3-columned matrix
d <- fapply(vowlax.dft.5, dct, 3)
# dct-smooth with 10 coefficients. d2 is spectral matrix
d2 <- fapply(vowlax.dft.5, dct, 10, TRUE)
# dct-smooth a trackdata object with 10 coefficients
d3 <- fapply(fric.dft[1:4,], dct, 10, TRUE)