Enumerated Ticks with Tickvals and Ticktext

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

Section

Set tickmode: "array" and supply explicit tickvals (positions) and ticktext (labels) to display exactly the ticks you want.

alias Plotly.{Figure, Scatter}

pi = :math.pi()
x = Enum.map(0..100, fn i -> i * 3 * pi / 100 end)
y = Enum.map(x, &:math.sin/1)

Figure.new()
|> Figure.add_trace(Scatter.new(x: x, y: y, mode: "lines"))
|> Figure.update_layout(
  title: "Enumerated Ticks with Tickvals and Ticktext",
  xaxis: %{
    tickmode: "array",
    tickvals: [0, pi, 2 * pi, 3 * pi],
    ticktext: ["0", "π", "2π", "3π"]
  }
)
|> Plotly.show()