# hboxplot: 2-D Generalization of Boxplot In hexbin: Hexagonal Binning Routines

## Description

If `bin` is an eroded `hexbin` object, i.e., an `erodebin` object, `hboxplot()` plots the high counts cells selected by `erode()`. By default, the high counts cells contain 50 percent of the counts so analagous to the interquartile “range”. The function distinguishes the last cells eroded using color. These cells correspond to one definition of the bivariate median.

## Usage

 ```1 2 3 4``` ```hboxplot(bin, xbnds = NULL, ybnds = NULL, density, border = c(0, grey(0.7)), pen = c(2, 3), unzoom = 1.1, clip ="off", reshape = FALSE, xlab = NULL, ylab = NULL, main = "") ```

## Arguments

 `bin` an object of class `hexbin`. `xbnds,ybnds` global x- and y-axis plotting limits for multiple plots. `density, border` arguments for `polygon()` each of length two, the first for the median, the second for the other cells. `pen` colors (“pen numbers”) for `polygon()`. `unzoom` plot limit expansion factor when `xbnds` is missing. `clip` either 'on' or 'off' are the allowed arguments, when on everything is clipped to the plotting region. `reshape` logical value to reshape the plot although `xbnds` and `ybnds` are present. `xlab, ylab, main` x- and y- axis labels and main title

## Details

The `density`, `border`, and `pen` arguments correspond to the `polygon` function calls for plotting two types of cells. The cell types, pen numbers and suggested colors are

 TYPE PEN COLOR cells of bin 2 light gray last eroded cells of bin (median cells) 1 black

The erode components of the hexbin objects must be present for the medians cells to plot.

When `xbnds` is missing or `reshape` is true, the plot changes graphics parameters and resets them. When `xbnds` is missing the function also zooms in based on the available data to provide increased resolution.

The zoom used the hexagon cell centers. The unzoom argument backs off a bit so the whole hexagon will fit in the plot.

`Hboxplot()` is used as a stand alone function, for producing separate legends .....

## Value

invisibly, the `hexViewport()` used internally. Used to add to the plot afterwards.

## References

see in `grid.hexagons`.

`hexbin`, `erode`, `hcell2xy`, `gplot.hexbin`, `grid.hexagons`, `grid.hexlegend`
 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15``` ```## boxplot of smoothed counts x <- rnorm(10000) y <- rnorm(10000) bin <- hexbin(x,y) erodebin <- erode(smooth.hexbin(bin)) hboxplot(erodebin) hboxplot(erodebin, density = c(32,7), border = c(2,4)) hp <- hboxplot(erodebin, density = c(-1,17), main = "hboxplot(erode*(smooth*(.)))") pushHexport(hp) library("grid") grid.points(x[1:10], y[1:10])# just non-sense to show the principle popViewport() ```