Basic Contour Plot

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

Section

Adding explicit x: and y: coordinate arrays maps the z matrix to real-world axis values. x must have the same length as the number of columns in z; y must have the same length as the number of rows.

alias Plotly.{Figure, Contour}

x = Enum.map(0..19, fn i -> -2.0 + i * 0.2 end)
y = Enum.map(0..19, fn j -> -2.0 + j * 0.2 end)

z = for yi <- y do
  for xi <- x do
    :math.exp(-((xi * xi) + (yi * yi)))
  end
end

Figure.new()
|> Figure.add_trace(Contour.new(x: x, y: y, z: z))
|> Figure.update_layout(title: "Basic Contour Plot — Gaussian Surface")
|> Plotly.show()