plotPolygonDensity: Plot distribution and histogram overlay
In jamba: Just Analysis Methods Base

plotPolygonDensity

R Documentation

Plot distribution and histogram overlay

Description

Plot distribution and histogram overlay

Usage

plotPolygonDensity(
  x,
  doHistogram = TRUE,
  doPolygon = TRUE,
  col = NULL,
  barCol = "#00337799",
  polyCol = "#00449977",
  polyBorder = makeColorDarker(polyCol),
  histBorder = makeColorDarker(barCol, darkFactor = 1.5),
  colAlphas = c(0.8, 0.6, 0.9),
  darkFactors = c(-1.3, 1, 3),
  lwd = 2,
  las = 2,
  u5.bias = 0,
  pretty.n = 10,
  bw = NULL,
  breaks = 100,
  width = NULL,
  densityBreaksFactor = 3,
  axisFunc = graphics::axis,
  bty = "l",
  cex.axis = 1.5,
  doPar = TRUE,
  heightFactor = 0.95,
  weightFactor = NULL,
  main = "Histogram distribution",
  xaxs = "i",
  yaxs = "i",
  xaxt = "s",
  yaxt = "s",
  xlab = "",
  ylab = "",
  log = NULL,
  xScale = c("default", "log10", "sqrt"),
  usePanels = TRUE,
  useOnePanel = FALSE,
  ablineV = NULL,
  ablineH = NULL,
  ablineVcol = "#44444499",
  ablineHcol = "#44444499",
  ablineVlty = "solid",
  ablineHlty = "solid",
  removeNA = TRUE,
  add = FALSE,
  ylimQuantile = 0.99,
  ylim = NULL,
  xlim = NULL,
  highlightPoints = NULL,
  highlightCol = "gold",
  verbose = FALSE,
  ...
)

Arguments

`x`	`numeric` vector, or `numeric` matrix. When a matrix is provided, each column in the matrix is used as its own data source.
`doHistogram`	`logical` indicating whether to plot histogram bars.
`doPolygon`	`logical` indicating whether to plot the density polygon.
`col`	`character` color, or when `x` is supplied as a matrix, a vector of colors is applied to across plot panels. Note that `col` will override all colors defined for `barCol`, `polyCol`, `histBorder`, `polyBorder`.
`barCol`, `polyCol`, `polyBorder`, `histBorder`	`character` colors used when `col` is not supplied. They define colors for the histogram bars, polygon fill, polygon border, and histogram bar border, respectively.
`colAlphas`	`numeric` vector with length 3, indicating the alpha transparency to use for histogram bar fill, polygon density fill, and border color, respectively. Alpha transparency should be scaled between 0 (fully transparent) and 1 (fully opaque). These alpha transparency values are applied to each color in `col` when `col` is defined.
`darkFactors`	`numeric` used to adjust colors when `col` is defined. Values are applied to histogram bar fill, polygon density fill, and border color, respectively, by calling `makeColorDarker()`.
`lwd`	`numeric` line width.
`las`	`integer` used to define axis label orientation.
`u5.bias`, `pretty.n`	`numeric` arguments passed to to `base::pretty()` to define pretty axis label positions.
`bw`	`character` string of the bandwidth name to use in the density calculation, passed to `jamba::breakDensity()`. By default `stats::density()` calls a very smooth density kernel, which obscures finer details, so the default in `jamba::breakDensity()` uses a more detailed kernel.
`breaks`	`numeric` breaks sent to `hist` to define the number of histogram bars. It can be in the form of a single `integer` number of equidistant breaks, or a `numeric` vector with specific break positions, but remember to include a starting value lower the the lowest value in `x`, and an ending value higher than the highest value in `x`. Passed to `breakDensity()`.
`width`	`numeric` passed to `breakDensity()`.
`densityBreaksFactor`	`numeric` scaling factor to control the level of detail in the density, passed to `breakDensity()`.
`axisFunc`	`function` optionally used in place of `graphics::axis()` to define axis labels.
`bty`	`character` string used to define the plot box shape, see `graphics::box()`.
`cex.axis`	`numeric` scalar to adjust axis label font size.
`doPar`	`logical` indicating whether to apply `graphics::par()`, specifically when `x` is supplied as a multi-column matrix. When `doPar=FALSE`, no panels nor margin adjustments are made at all.
`heightFactor`	`numeric` value indicating the height of the y-axis plot scale to use when scaling the histogram and polygon density within each plot panel.
`weightFactor`	`numeric` passed to `breakDensity()`.
`main`	`character` title to display above the plot, used only when `x` is supplied as a single `numeric` vector. Otherwise each plot title uses the relevant `colnames(x)` value.
`xaxs`, `yaxs`, `xaxt`, `yaxt`	`character` string indicating the type of x-axis and y-axis to render, see `graphics::par()`.
`xlab`, `ylab`	`character` labels for x-axis and y-axis, respectively.
`log`	`character` vector, optionally containing `"x"` and/or `"y"` to to indicate which axes are log-transformed. If `"x" %in% log` then it sets `xScale="log10"`, both methods are equivalent in defining the log-transformation of the x-axis.
`xScale`	`character` string to define the x-axis transformation: `"default"` applies no transform; `"log10"` applies a log10 transform, specifically `log10(x + 1)` `"sqrt"` applies a sqrt transform.
`usePanels`	`logical` indicating whether to separate the density plots into panels when `x` contains multiple columns. When `useOnePanel=FALSE` the panels will be defined so that all columns will fit on one page.
`useOnePanel`	`logical` indicating whether to define multiple panels on one page. Therefore `useOnePanel=TRUE` will create multiple pages with one panel on each page, which may work well for output in multi-page 'PDF' files.
`ablineV`, `ablineH`	`numeric` vector representing abline vertical and horizontal positions, respectively. These values are mostly helpful in multi-panel plots, to draw consistent reference lines on each panel.
`ablineVcol`, `ablineHcol`	default"#44444499", with the abline color, used when `ablineV` or `ablineH` are supplied, respectively.
`ablineVlty`, `ablineHlty`	`numeric` or `character` indicating the line type to use for `ablineV` and `ablineH`, respectively.
`removeNA`	`logical` indicating whether to remove NA values prior to running histogram and density calculations. Presence of NA values generally causes both functions to fail.
`add`	`logical` indicating whether to add the plot to an existing visualization.
`ylimQuantile`	`numeric` value between 0 and 1, indicating the quantile value of the density `y` values to use for the ylim. This threshold is only applied when `ylim` is NULL.
`ylim`, `xlim`	`numeric` y-axis and x-axis ranges, respectively. When either is `NULL`, the axis range is determined independently for each plot panel. Either value can be supplied as a `list` to control the numeric range for each individual plot, relevant only when `x` is supplied as a multi-column matrix.
`highlightPoints`	`character` vector of optional rownames, or `integer` values with row indices, for rows to be highlighted. When `x` is supplied as a `matrix`, `highlightPoints` can be supplied as a `list` of vectors, referring to each column in `x`. When rows are highlighted, the plot is drawn with all points, then the highlighted points are drawn again over the histogram bars, and polygon density, as relevant.
`highlightCol`	`character` vector of colors to use to fill the histogram when `highlightPoints` is supplied. Multiple values are recycled one per column in `x`, if `x` is supplied as a multi-column matrix.
`verbose`	`logical` indicating whether to print verbose output.
`...`	additional arguments are passed to relevant internal functions.

Details

This function is a wrapper around graphics::hist() and stats::density(), with enough customization to cover most of the situations that need customization.

For example log="x" will automatically log-transform the x-axis, keeping the histogram bars uniformly sized. Alternatively, xScale="sqrt" will square root transform the data, and transform the x-axis while keeping the numeric values constant.

It also scales the density profile height to be similar to the histogram bar height, using the 99th quantile of the y-axis value, which helps prevent outlier peaks from dominating the y-axis range, thus obscuring interesting smaller features.

If supplied with a data matrix, this function will create a layout with ncol(x) panels, and plot the distribution of each column in its own panel, using categorical colors from rainbow2().

For a similar style using ggplot2, see plotRidges(), which displays only the density profile for each sample, but in a much more scalable format for larger numbers of columns.

By default NA values are ignored, and the distributions represent non-NA values.

Colors can be controlled using the parameter col, but can be specifically defined for bars with barCol and the polygon with polyCol.

Value

invisible list with density and histogram data output, however this function is called for the by-product of its plot output.

Examples

# basic density plot
set.seed(123);
x <- stats::rnorm(2000);
plotPolygonDensity(x, main="basic polygon density plot");

# fewer breaks
plotPolygonDensity(x,
   breaks=20,
   main="breaks=20");

# log-scaled x-axis
plotPolygonDensity(10^(3+stats::rnorm(2000)), log="x",
   breaks=50,
   main="log-scaled x-axis");

# highlighted points
set.seed(123);
plotPolygonDensity(x,
   highlightPoints=sample(which(abs(x) > 1), size=200),
   breaks=40,
   main="breaks=40");

# hide axis labels
set.seed(123);
plotPolygonDensity(x,
   highlightPoints=sample(which(abs(x) > 1), size=200),
   breaks=40,
   xaxt="n",
   yaxt="n",
   main="breaks=40");

# multiple columns
set.seed(123);
xm <- do.call(cbind, lapply(1:4, function(i){stats::rnorm(2000)}))
plotPolygonDensity(xm, breaks=20)

jamba documentation built on April 4, 2025, 5:14 a.m.