title: Plotting a grid of squares in MATLAB
body: <p>I would like to plot a square in a 2D cartesian coordinate system with its corners at <code>(±1,±1)</code>. I would like to further divide it to 400 smaller and equal squares each with an edge length of <code>0.1</code>. </p>
  
  <p>How can I do this in MATLAB?</p>