Basic Heatmap

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

Section

Heatmap.new(z: [[...]]) renders a 2D matrix as a colour-encoded grid. Each inner list is a row. The default colour scale maps low values to blue and high values to red ("RdBu" reversed, or the default Plotly scale).

alias Plotly.{Figure, Heatmap}

z = [
  [1,  20, 30],
  [20, 1,  60],
  [30, 60, 1 ]
]

Figure.new()
|> Figure.add_trace(Heatmap.new(z: z))
|> Figure.update_layout(title: "Basic Heatmap")
|> Plotly.show()