Hi, I have a question concerning element selection in an array. Suppose you have the following arrays:
B = [17 24 1 8 15; 23 5 7 14 16;4 6 13 20 22; 10 12 19 21 3;11 18 25 2 9] E =[5 5 5 4 5 5 5 5 1 5] If I type: B[E] I get: 11 11 11 10 11 11 11 11 17 11 The 5th element of B is 11, so since E = 5, 5, 5... the first three elements of B[E] is 11 11 11. Now, comes my question: is there a way to do this for all columns of B? In Matlab, I would write something like: B(E,:) and get >> B(E,:) ans = 11 18 25 2 9 11 18 25 2 9 11 18 25 2 9 10 12 19 21 3 11 18 25 2 9 11 18 25 2 9 11 18 25 2 9 11 18 25 2 9 17 24 1 8 15 11 18 25 2 9 but this doesn't work in Julia B[E,:] ERROR: no method getindex(Array{Int64,2}, Array{Int64,2}, UnitRange{Int64}) so I need to write a loop: S = zeros(10,5) x = [1 2 3 4 5] for i in x S[:,i] = B[:,i][E[end,:]] end Is there a way to avoid this loop?