2D Histogram Binning and Styling Options

Mix.install([
  {:plotly_ex, "~> 0.3"},
  {:kino, "~> 0.18"}
])

Section

nbinsx: / nbinsy: control how many bins appear on each axis. colorscale: picks a named Plotly colour scale (e.g. "Hot", "Viridis", "Jet"). reversescale: true flips the colour direction.

alias Plotly.{Figure, Histogram2d}

:rand.seed(:exsss, {1, 2, 3})

gen = fn n ->
  for _ <- 1..n do
    (for _ <- 1..12, do: :rand.uniform()) |> Enum.sum() |> Kernel.-(6.0)
  end
end

n = 500
x = gen.(n)
y = gen.(n)

Figure.new()
|> Figure.add_trace(
  Histogram2d.new(
    x: x,
    y: y,
    nbinsx: 20,
    nbinsy: 20,
    colorscale: "Hot",
    reversescale: true
  )
)
|> Figure.update_layout(title: "2D Histogram — Custom Bins and Colourscale")
|> Plotly.show()