title: How to read matrix from file in octave?
body: <p>I am trying to read a matrix from file in Octave but I just can't find a solution.
  The input file is:</p>
  
  <pre><code>4
  1 4 2 3
  1 4 2 1
  4 2 1 4
  1 2 1 3
  </code></pre>
  
  <p>where 4 is the number of rows and columns. I want to be able to store that information in a matrix and to be able to use it's elements by calling them like <code>a(2,3)</code>.</p>