title: How to have multidimensional array with different length in Julia
body: <p>I need to make a sequence of an array with different length by reading a dataset. I need to call each of them in a loop so probably I need some sort of indexing in order to call them. For example, how can I create the following sequence:</p>
  
  <pre><code>P[1]=[1 2 3 4]
  P[2]=[1 4]
  P[3]=[8 9 0 0 5 6]
  .
  .
  .
  </code></pre>