Symbol Size Mapping

Symbol Size Mapping

Usage

palette_size_sequential(range = c(1, 6), ...)

palette_size_diverging(range = c(1, 6), midpoint = 0, ...)

Arguments

range

A length-two numeric vector giving range of possible sizes (greater than 0).

...

Currently not used.

midpoint

A length-one numeric vector specifying the data mid-point.

Value

A palette function that when called with a single argument (a numeric vector of continuous values) returns a numeric vector giving the amount by which plotting text and symbols should be magnified relative to the default.

See also

Other palettes: palette_color_continuous(), palette_color_discrete(), palette_color_picker(), palette_shape()

Examples

## Visualize a simple DEM model
## Distribution of elevation values
elevation <- hist(volcano)


## Where are breaks?
elevation$breaks
#>  [1]  90 100 110 120 130 140 150 160 170 180 190 200

## Build palette functions
BuRd <- color("BuRd")
ramp_BuRd <- palette_color_continuous(colors = BuRd(10))

## Plot image
image(volcano, col = ramp_BuRd(elevation$breaks))
legend("topright", legend = elevation$breaks, fill = ramp_BuRd(elevation$breaks))


## Scatter plot
## Build color palette functions
YlOrBr <- color("YlOrBr")
pal_color <- palette_color_continuous(colors = YlOrBr)

## Build symbol palette functions
pal_size <- palette_size_sequential(range = c(1, 3))

## Plot
plot(
  x = iris$Petal.Length,
  y = iris$Sepal.Length,
  pch = 16,
  col = pal_color(iris$Petal.Length),
  cex = pal_size(iris$Petal.Length),
  xlab = "Petal length",
  ylab = "Sepal length",
  panel.first = grid(),
  las = 1
)