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, type = "l", ci.col = "blue",
main = NULL, sub = NULL,
plot.type = c("marginal", "coherency", "phase"),
ci.lty = 3, ...)

### Arguments

`x` |
an object of class `"spec"` . |

`add` |
logical. If `TRUE` , add to already existing plot. |

`ci` |
Coverage probability for confidence interval. Plotting of
the confidence bar 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"` . |

`xlab` |
the x label of the plot. |

`ylab` |
the y label of the plot. |

`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. |

`main` |
overall title for the plot. |

`sub` |
a sub title for the plot. |

`plot.type` |
For multivariate time series, the type of plot
required. Only the first character is needed. |

`ci.lty` |
line type for confidence intervals for coherency and
phase. |

`...` |
Further graphical parameters. |

### See Also

`spectrum`

[Package

*stats* version 2.1.0

Index]