How do I slice an array by index in julia

Question

So say a=[[1 2];[3 4];[5 6]] and x is [1,2,1] how would I extract the vector [1,4,5]; that is, the index-x element of each row.

Answer 1

You can use broadcasting. Use Ref(a) to avoid broadcasting over a:

julia>  getindex.(Ref(a),1:length(x),x)
3-element Array{Int64,1}:
 1
 4
 5