Display a "violin" plot

Displays violin plots (rotated kernel density plots on each side of boxplots).

Usage

violin_plot(X=rnorm(50),at,add=FALSE,na.rm=TRUE,bw,violin_width,
 violin_end_width=0.005,equal_width=TRUE,show_box=TRUE,box_width=0.01,
 box_col="black",show_outliers=TRUE,outlier_pch=NA,range=1.5,xlim,ylim,
 axes=TRUE,ann=TRUE,xlab="",ylab="",x_axis_labels,main="Violin Plot",
 col="red",median_col="white",show_mean=FALSE,mean_pch=19,
 mean_pch_col="yellow",...)

Arguments

X

A vector or matrix or data frame of numeric values.

at

Horizontal position(s) for the violin plot(s).

add

Whether this violin should be added to an existing plot.

na.rm

Remove NA values. Passed to functions such as boxplot or density.

bw

Vector or bandwidth values for density. Will be recycled. If not provided then will be calculated using bw.nrd0.

violin_width

Multiplier to scale the width of the violin.

violin_end_width

Multiplier to scale the width of the ends of the violin.

equal_width

Should all violin widths be equal?

show_box

Whether to display the box.

box_width

Multiplier for the width of internal boxes.

box_col

Fill color for the internal rectangle.

show_outliers

Whther to display outliers as points.

outlier_pch

Symbol for displaying outliers.

range

Passed to boxplot.

xlim,ylim

Explicitly set the plot limits.

axes

Logical value indicating whether both axes should be drawn on the plot.

ann

Annotate the plots with axis titles and overall titles.

xlab,ylab

Labels for the X and Y axes.

x_axis_labels

Labels for the violins.

main

Title for the violin plot.

col

Fill color for the violin(s). Will be recycled.

median_col

Fill color for the median mark.

show_mean

Whether to plot the mean as well as the median.

mean_pch

Symbol to use for the mean.

mean_pch_col

Fill color for the mean symbol.

...

Extra arguments passed to polygon used for representing violin(s).

Details

violin_plot displays one or more violin plots by drawing rotated kernel density curves on each side of box plots.

Value

nil

Author

Darshan Baral

Examples

 # plotting a data frame
 violin_plot(mtcars)


 set.seed(42)
 normvar<-c(rnorm(49),-3)
 unifvar<-runif(50,-2,2)
 normvar2<-rnorm(45)

 # plotting a matrix
 violin_plot(matrix(c(normvar,unifvar),ncol=2),
  main="Default Plot",x_axis_labels=c("Normal","Uniform"))


 # plotting with different colors and with at specified
 violin_plot(matrix(c(normvar,unifvar),ncol=2),at=1:3,
  main="Different colors and extra space",
  x_axis_labels=c("Normal","Uniform","Normal"),
  show_outliers=TRUE,col=c("blue","red"),median_col="lightgray",
  pch=6)

 # adding a violin to existing plot
 violin_plot(normvar2,at=3,add=TRUE,col="green",violin_width=1)