title: matlab-how to draw scatter plot for matrix
body: <p>If my data is:</p>
  
  <pre><code>x = [x1;x2;x3;x4;x5];
  x = [0.2 0.1 0.1;0.3 0.3 0.4;0.2 0.4 0,4;0.5 0.4 0.6;0.1 0.4 0.3];
  </code></pre>
  
  <p>How to draw a scatter plot for this matrix with PCA style?</p>