Skip to contents

Map Values to Colors using Color Themes

Source: R/to_colors.R
to.colors.Rd

to.colors() maps a vector of data values to a vector of hexadecimal color codes based on a specified color theme. It automatically handles both discrete and continuous variables, appropriately scaling the values and handling missing data.

Usage

to.colors(x, theme = NULL, middle = 0, na.value = NULL)

Arguments

x

a vector of data values (discrete or continuous) to be mapped to colors.

theme

a color theme name (e.g., "Viridis"), a character vector of color names, or a palette/ramp function. See ?color.theme for more details.

middle

a numeric value specifying the middle point for the diverging color themes. Default is 0.

na.value

a character string specifying the color for NA values. If NULL (default), it falls back to the theme's default na.color option.

Value

a character vector of hexadecimal color codes.

See also

color.theme

Examples

# Continuous mapping (Sequential)
plot(cars, col = to.colors(cars$speed, "Viridis"), pch = 19)


# Discrete mapping (Qualitative)
plot(iris$Sepal.Length, iris$Sepal.Width,
     col = to.colors(iris$Species, "Set2"), pch = 19)