title: How to add vectors to the columns of some array in Julia?
body: <p>I know that, with package <code>DataFrames</code>, it is possible by doing simply</p>
  
  <pre><code>julia&gt; df = DataFrame();
  
  julia&gt; for i in 1:3
            df[i] = [i, i+1, i*2]
         end
  
  julia&gt; df
  3x3 DataFrame
  |-------|----|----|----|
  | Row # | x1 | x2 | x3 |
  | 1     | 1  | 2  | 3  |
  | 2     | 2  | 3  | 4  |
  | 3     | 2  | 4  | 6  |
  </code></pre>
  
  <p>... but are there any means to do the same on an empty <code>Array{Int64,2}</code> ?</p>