Rose Diagram

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Description

Plots a rose diagram (rose of directions), the analogue of a histogram or density plot for angular data.

Usage

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rose(x, ...)

## Default S3 method:
rose(x, breaks = NULL, ...,
                       weights=NULL,
                       nclass = NULL,
                       unit = c("degree", "radian"),
                       start=0, clockwise=FALSE,
                       main)

## S3 method for class 'histogram'
rose(x, ...,
                       unit = c("degree", "radian"),
                       start=0, clockwise=FALSE,
                       main, labels=TRUE, at=NULL, do.plot = TRUE)

## S3 method for class 'density'
rose(x, ..., 
                  unit = c("degree", "radian"), 
                  start=0, clockwise=FALSE,
                  main, labels=TRUE, at=NULL, do.plot = TRUE)

## S3 method for class 'fv'
rose(x, ..., 
                  unit = c("degree", "radian"),
                  start=0, clockwise=FALSE,
                  main, labels=TRUE, at=NULL, do.plot = TRUE)

Arguments

x

Data to be plotted. A numeric vector containing angles, or a histogram object containing a histogram of angular values, or a density object containing a smooth density estimate for angular data, or an fv object giving a function of an angular argument.

breaks, nclass

Arguments passed to hist to determine the histogram breakpoints.

...

Additional arguments passed to polygon controlling the appearance of the plot (or passed from rose.default to hist to control the calculation of the histogram).

unit

The unit in which the angles are expressed.

start

The starting direction for measurement of angles, that is, the spatial direction which corresponds to a measured angle of zero. Either a character string giving a compass direction ("N" for north, "S" for south, "E" for east, or "W" for west) or a number giving the angle from the the horizontal (East) axis to the starting direction. For example, if unit="degree" and clockwise=FALSE, then start=90 and start="N" are equivalent. The default is to measure angles anti-clockwise from the horizontal axis (East direction).

clockwise

Logical value indicating whether angles increase in the clockwise direction (clockwise=TRUE) or anti-clockwise, counter-clockwise direction (clockwise=FALSE, the default).

weights

Optional vector of numeric weights associated with x.

main

Optional main title for the plot.

labels

Either a logical value indicating whether to plot labels next to the tick marks, or a vector of labels for the tick marks.

at

Optional vector of angles at which tick marks should be plotted. Set at=numeric(0) to suppress tick marks.

do.plot

Logical value indicating whether to really perform the plot.

Details

A rose diagram or rose of directions is the analogue of a histogram or bar chart for data which represent angles in two dimensions. The bars of the bar chart are replaced by circular sectors in the rose diagram.

The function rose is generic, with a default method for numeric data, and methods for histograms and function tables.

If x is a numeric vector, it must contain angular values in the range 0 to 360 (if unit="degree") or in the range 0 to 2 * pi (if unit="radian"). A histogram of the data will first be computed using hist. Then the rose diagram of this histogram will be plotted by rose.histogram.

If x is an object of class "histogram" produced by the function hist, representing the histogram of angular data, then the rose diagram of the densities (rather than the counts) in this histogram object will be plotted.

If x is an object of class "density" produced by circdensity or density.default, representing a kernel smoothed density estimate of angular data, then the rose diagram of the density estimate will be plotted.

If x is a function value table (object of class "fv") then the argument of the function will be interpreted as an angle, and the value of the function will be interpreted as the radius.

By default, angles are interpreted using the mathematical convention where the zero angle is the horizontal x axis, and angles increase anti-clockwise. Other conventions can be specified using the arguments start and clockwise. Standard compass directions are obtained by setting unit="degree", start="N" and clockwise=TRUE.

Value

A window (class "owin") containing the plotted region.

Author(s)

\adrian \rolf

and \ege

See Also

fv, hist, circdensity, density.default.

Examples

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  ang <- runif(1000, max=360)
  rose(ang, col="grey")
  rose(ang, col="grey", start="N", clockwise=TRUE)

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