plot.spec {stats}  R Documentation 
Plotting Spectral Densities
Description
Plotting method for objects of class "spec"
. For multivariate
time series it plots the marginal spectra of the series or pairs plots
of the coherency and phase of the crossspectra.
Usage
## S3 method for class 'spec':
plot(x, add = FALSE, ci = 0.95, log = c("yes", "dB", "no"),
xlab = "frequency", ylab = NULL, type = "l",
ci.col = "blue", ci.lty = 3,
main = NULL, sub = NULL,
plot.type = c("marginal", "coherency", "phase"),
...)
plot.spec.phase(x, ci = 0.95,
xlab = "frequency", ylab = "phase",
ylim = c(pi, pi), type = "l",
main = NULL, ci.col = "blue", ci.lty = 3, ...)
plot.spec.coherency(x, ci = 0.95,
xlab = "frequency",
ylab = "squared coherency",
ylim = c(0, 1), type = "l",
main = NULL, ci.col = "blue", ci.lty = 3, ...)
Arguments
x 
an object of class "spec" . 
add 
logical. If TRUE , add to already existing plot.
Only valid for plot.type = "marginal" .

ci 
coverage probability for confidence interval. Plotting of
the confidence bar/limits is omitted unless ci is strictly
positive. 
log 
If "dB" , plot on log10 (decibel) scale (as SPLUS),
otherwise use conventional log scale or linear scale. Logical
values are also accepted. The default is "yes" unless
options(ts.S.compat = TRUE) has been set, when it is
"dB" . Only valid for plot.type = "marginal" .

xlab 
the x label of the plot. 
ylab 
the y label of the plot. If missing a suitable label will
be constructed. 
type 
the type of plot to be drawn, defaults to lines. 
ci.col 
colour for plotting confidence bar or confidence
intervals for coherency and phase. 
ci.lty 
line type for confidence intervals for coherency and
phase. 
main 
overall title for the plot. If missing, a suitable title
is constructed. 
sub 
a sub title for the plot. Only used for plot.type =
"marginal" . If missing, a description of the smoothing is used. 
plot.type 
For multivariate time series, the type of plot
required. Only the first character is needed. 
ylim, ... 
Graphical parameters. 
See Also
spectrum
[Package
stats version 2.5.0
Index]