title: How to plot and display a square in Octave?
body: <p>I cannot achieve to plot a square in Octave. 
  I cannot force equally scaled axes, so I am getting a rectangle instead:</p>
  
  <p><img src="https://i.stack.imgur.com/DBflo.png" alt="enter image description here"></p>
  
  <p>The following trials are not working:</p>
  
  <pre><code>x = [0, 1, 1, 0, 0]';
  y = [0, 0, 1, 1, 0];
  plot(x, y), axis equal, axis([-1,2, -1,2])
  % figure('Position', [10,10,100,100]); %[startx,starty,width,height]
  % plot(x, y)
  </code></pre>
  
  <p>Probably I would need to specify a fixed window size and equally
  scaled axes. I would be satisfied, when the first such display window
  would show a correct square. A luxury solution would make the window
  (or its content)
  not interactively resizable. </p>
  
  <p>Remarks:</p>
  
  <ol>
  <li>I have Octave 3.2.4 on Windows XP.</li>
  <li>The suggestion in <a href="https://stackoverflow.com/q/607751/805681">Stackoverflow</a>
  does not work.</li>
  </ol>