Heatmap with Categorical Axis Labels

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

Section

Passing string lists as x: and y: creates categorical axes with labelled ticks. x labels the columns; y labels the rows. Length of x must equal number of columns in z; length of y must equal number of rows.

alias Plotly.{Figure, Heatmap}

z = [
  [1,  20, 30, 50, 1 ],
  [20, 1,  60, 80, 30],
  [30, 60, 1,  5,  20]
]

Figure.new()
|> Figure.add_trace(
  Heatmap.new(
    z: z,
    x: ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"],
    y: ["Morning", "Afternoon", "Evening"],
    colorscale: "Viridis"
  )
)
|> Figure.update_layout(title: "Heatmap with Categorical Axis Labels")
|> Plotly.show()