Scalogram plotting — plot.fcwtr

Plots the scalogram resulting from fcwt(). Requires ggplot2.

Usage

# S3 method for class 'fcwtr_scalogram'
plot(x, n = 1000, time_unit = "s", freq_unit = "Hz", transf = identity, ...)

Arguments

x: An "fcwtr_scalogram" object resulting from fcwt().
n: The plotting function reduces the time resolution by averaging to generate a reasonable graphics format. n is the number of time steps that are plotted. Defaults to n = 1000.
time_unit: A time unit that is used for the x-axis scale. Default to "s" - seconds. See units::valid_udunits() and units::valid_udunits_prefixes() for valid expressions.
freq_unit: A frequency unit that is used for the y-axis scale. Defaults to "Hz" - "Hertz". See units::valid_udunits() and units::valid_udunits_prefixes() for valid expressions.
transf: A function, taking a vector and returning a vector, that is used to transform the scalogram values before plotting.
...: other arguments passed to specific methods

Value

No return value, called for side effects.

Examples

ts_sin_440 <- sin((1:4410) * 2 * pi * 440 / 44100)

res <-
  fcwt(
    ts_sin_440,
    x_sample_freq = u(44100, "Hz"),
    freq_begin = u(50, "Hz"),
    freq_end = u(1000, "Hz"),
    n_freqs = 10,
    sigma = 5
  )

plot(res, time_unit = "ms")