Julia でソンブレロを描く

using Plots

function draw_sombrero()
    x = range(-3π, stop = 3π, length = 100)
    y = range(-3π, stop = 3π, length = 100)
    surface(x, y, (x, y) -> sin(sqrt(x^2 + y^2)) / sqrt(x^2 + y^2), camera=(30, 20))
end

draw_sombrero()

using LinearAlgebra
function draw_sombrero2()
    x = y = range(-3, stop = 3, length = 100)
    surface(x, y, (x, y) -> sinc(norm([x, y])))
end

draw_sombrero2()