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 cross-spectra.

### 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 S-PLUS), 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 3.3.0 Index]