# chist: Circular Histogram and Rose Diagram In cplots: Plots for Circular Data

## Description

Function `chist` can be used to plot 2-dimensional histograms and rose diagrams for circular data.

## Usage

 ```1 2 3 4``` ```chist(x, nbins = 36, radius = 1/sqrt(base::pi), area.prop = TRUE, prob = TRUE, total.area = 1, nlabels = 4, col = "lightblue", border = "skyblue4", m = NA, xlim = NULL, ylim = NULL, main = NULL) ```

## Arguments

 `x` a numeric vector storing angular values between 0 and 2 pi, or an object that can be coerced to. `nbins` the number of bins of the circular histogram. Internally, it is rounded to a multiple of 4. `radius` the radius of the reference circle. If `radius = 0`, a rose diagram is produced; if `radius > 0`, a circular histogram is produced outside the reference circle. `area.prop` logical; if `TRUE`, an area-proportional transformation is applied; if `FALSE`, a height-proportional transformationis applied. `prob` logical; if `TRUE`, the circular histogram graphic is a representation of probability densities; if `FALSE`, a representation of frequencies. `total.area` a positive number specifying the total area under the density curve. If `total.area = NULL`, no scaling is applied, the plot is in the original scale. If `area.prop = TRUE`, the total area is automatically unity without scaling. `nlabels` integer, for the number of levels for the density/frequency values to be plotted; if `0`, no label is plotted `col` the color to fill the bars. `border` the color of the border around the bars. `m` the number of points within each bin to plot the circular histogram. The larger the number is, the smoother the plot looks. `xlim` numeric vectors of length 2, giving the x coordinates ranges. `ylim` numeric vectors of length 2, giving the y coordinates ranges. `main` the main title (on top)

## Author(s)

Danli Xu <dxu452@aucklanduni.ac.nz>, Yong Wang <yongwang@auckland.ac.nz>

## References

Xu, D. and Wang, Y. (2019) Area-proportional Visualization for Circular Data (submitted).

## See Also

`cbarplot`, `cdensity`, `cdotplot`

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14``` ```# 600 observations from two von Mises distributions library(circular) x = c(rvonmises(200, circular(pi/4), 5), rvonmises(400, circular(pi), 20)) chist(x) # area-proportional circular histgram chist(x, area = FALSE) # height-proportional circular histgram chist(x, radius=0) # area-proportional rose diagram chist(x, radius=0, area=FALSE) # height-proportional rose diagram chist(x, prob=FALSE) # labels for frequency chist(x, nlabels=0) # no label chist(x, xlim=c(-1.7,1)) # use xlim chist(x, area=FALSE, total=2) # with scaling chist(x, area=FALSE, total=NULL) # without scaling ```

cplots documentation built on May 2, 2019, 12:19 p.m.