`vcat([], [1 2])` # OK. `vcat([], [1 "2"])` # Not OK

[WuSiren]

Can't concatenate a matrix to `Any[]` horizontally

Block1: a = [] b = [1 2; 3 4] a = vcat(a, b) # or a = [a; b] Block2: a = [] b = [1 2; 3 4] a = hcat(a, b) # or a = [a b] Question: Block1 works but Block2 doesn’t. Why?

Thanks. Maybe it is due to Julia version as the post above. Sorry… I was just looking for an approach to recording some process results in a loop. May I ask for some good advice on the following code?

rec = []
for i = 1:10
    rec = cat(rec, rand(3)'; dims=1)
end
rec

Thanks again.