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

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

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

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

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

A window (class `"owin"`

) containing the plotted region.

- 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.

Adrian Baddeley Adrian.Baddeley@curtin.edu.au

Rolf Turner r.turner@auckland.ac.nz

and Ege Rubak rubak@math.aau.dk

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`

.

`fv`

, `hist`

,
`circdensity`

,
`density.default`

.

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

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