plot-QuantileSD: Plot the values of the 'QuantileSD'.
In quantspec: Quantile-Based Spectral Analysis of Time Series

Description Usage Arguments Details Value

Creates a K x K plot depicting a quantile spectral density. In each of the subplots either the real part (on and below the diagonal; i. e., tau1 <= tau2) or the imaginary parts (above the diagonal; i. e., tau1 > tau2) of

the quantile spectral density (red line),
the means of the quantile periodograms used in the simulation (black line),

for the combination of levels tau1 and tau2 denoted on the left and bottom margin of the plot are displayed.

## S4 method for signature 'QuantileSD,ANY'
plot(
  x,
  ratio = 3/2,
  widthlab = lcm(1),
  xlab = expression(omega/2 * pi),
  ylab = NULL,
  frequencies = 2 * pi * (1:(floor(x@N/2)))/x@N,
  levels = getLevels(x, 1)
)

`x`	The `QuantileSD` to plot
`ratio`	quotient of width over height of the subplots; use this parameter to produce landscape or portrait shaped plots.
`widthlab`	width for the labels (left and bottom); default is `lcm(1)`, cf. `layout`.
`xlab`	label that will be shown on the bottom of the plots; can be an expression (for formulas), characters or `NULL` to force omission (to save space).
`ylab`	label that will be shown on the left side of the plots; can be an expression (for formulas), characters or `NULL` to force omission (to save space).
`frequencies`	a set of frequencies for which the values are to be plotted.
`levels`	a set of levels for which the values are to be plotted.