title: What's the equivalence of cell2mat of Matlab in Julia?
body: <p>Well, I am not sure if some of you has encountered the same issue.
  I need to convert a matlab program into julia where 'cell2mat' was extensively used.
  For example a big matrix A is composed of 3*2 small matrix, see a11, a12, a21, a22, a31, a32, whose dimensions are all 4*2.
  Or    <code>A = [a11 a12; a21 a22; a31 a32]</code>     with    <code>a11 = rand(4,2)</code>     for example.
  I first used an <code>Array{Array{Float64,2},1}</code> type to create the whole matrix A.
  Then, I need to convert this A into a usual matrix, say, <code>Array{Float64,2}</code>.
  I did try to do like <code>hvcat((NUM),A...)</code>, but the order of the converted matrix doesn't correspond to the original <code>Array{Array{Float64,2},1}</code> type. 
  Thanks for anyone who could provide some pistes.
  Wish you all a good day!</p>