CairoMakie中arrows2d!函数不可用，是否已更改名称？

你遇到的UndefVarError: arrows2d! not defined是因为Makie已将arrows2d!重命名为arrows!，旧函数名已被移除。

你提供的原代码：

f = Figure(size = (800, 800))
Axis(f[1, 1], backgroundcolor = "black")

xs = LinRange(0, 2pi, 20)
ys = LinRange(0, 3pi, 20)
us = [sin(x) * cos(y) for x in xs, y in ys]
vs = [-cos(x) * sin(y) for x in xs, y in ys]
strength = vec(sqrt.(us .^ 2 .+ vs .^ 2))

arrows2d!(xs, ys, us, vs, lengthscale = 0.2, color = strength)

f

修正后的代码（仅替换函数名）：

f = Figure(size = (800, 800))
Axis(f[1, 1], backgroundcolor = "black")

xs = LinRange(0, 2pi, 20)
ys = LinRange(0, 3pi, 20)
us = [sin(x) * cos(y) for x in xs, y in ys]
vs = [-cos(x) * sin(y) for x in xs, y in ys]
strength = vec(sqrt.(us .^ 2 .+ vs .^ 2))

arrows!(xs, ys, us, vs, lengthscale = 0.2, color = strength)

f

当前Makie稳定版本统一使用arrows!绘制2D箭头场，官方文档的旧内容可能未及时同步更新，替换后即可正常运行。

内容的提问来源于stack exchange，提问作者Mstislav Keldysh