Altair plot concatenation

Altair plots can be concatenated using the following operators: +, |, and &

# S3 method for altair.vegalite.v4.api.TopLevelMixin
|(e1, e2)

# S3 method for altair.vegalite.v4.api.TopLevelMixin
+(e1, e2)

# S3 method for altair.vegalite.v4.api.TopLevelMixin
&(e1, e2)

Arguments

e1

Altair chart object

e2

Altair chart object

Value

Compound Altair chart object

Examples

if (interactive()){

  # Examples using the beaver1 and beaver2 body temperature data sets
  # Layering Charts
  base <- alt$Chart(beaver1)$encode(
    x = alt$X('time'),
    y = alt$Y('temp', scale = alt$Scale(zero = FALSE))
  )

  scatter_plot <- base$mark_point()
  line_plot <- base$mark_line()

  combined_plot <- scatter_plot + line_plot

  # Horizontal Concatenation
  base2 <- alt$Chart(beaver2)$
    encode(
      x = alt$X("time"),
      y = alt$Y("temp", scale = alt$Scale(zero = FALSE))
    )

  scatter_plot2 <- base2$mark_point()
  line_plot2 <- base2$mark_line()

  combined_plot <-
    (scatter_plot + line_plot)$
    properties(title = "Beaver 1", width = 200)

  combined_plot2 <-
    (scatter_plot2 + line_plot2)$
    properties(title = "Beaver 2", width = 200)

  hconcat_plot <- combined_plot | combined_plot2

  # Vertical Concatenation
  vconcat_plot <- combined_plot & combined_plot2

}