Map a function at a given level of a tree

[tkf]

It can be done with a recursive definition like this:

Idiomatic way to write element-wise combination of array of arrays?

More generally, you can recursively define this broadcast up to any depth n like this julia> function rebroadcast(f,n,args...) n>1 ? rebroadcast(broadcast,n-1,(f,args...)) : broadcast(f, args...) end rebroadcast (generic function with 1 method) julia> rebroadcast(div,1,[1],[2]) 1-element Array{Int64,1}: 0 julia> rebroadcast(div,2,b,a) 2-element Array{Array{Int64,1},1}: [1, 0, 0] [0, 0, 0] julia> rebroadcast(div,3,ab,aa) 2-element Array{Array{Array{Int64,1},1},1}: [[1, 1…