julia - 如何并行迭代两个数组

Question

我有两个要同时迭代的数组。

我正在使用这个:

julia> xs = [1,2,3];

julia> ys = [4,5,6];

julia> for i in 1:length(xs)
           x = xs[i]
           y = ys[i]
           @show x, y
       end
(x, y) = (1, 4)
(x, y) = (2, 5)
(x, y) = (3, 6)

有没有更好的方法来迭代 Julia 中的多个数组？

Answer 1

使用 zip 随着元组解构:

julia> xs = [1,2,3];

julia> ys = [4,5,6];

julia> for (x, y) in zip(xs, ys)
           @show x, y
       end
(x, y) = (1, 4)
(x, y) = (2, 5)
(x, y) = (3, 6)

zip将在最短数组处停止迭代:

julia> for (x, y) in zip([1,2], [0,0,0])
           @show x, y
       end
(x, y) = (1, 0)
(x, y) = (2, 0)

这种模式可以推广到任意数量的列表:

julia> for (x, y, z) in zip([1,2], [3,4], [5,6])
           @show x, y, z
       end
(x, y, z) = (1, 3, 5)
(x, y, z) = (2, 4, 6)