title: Marker size unit proportionnal to the axis values
body: <p>I have an X Y Z dataset.
  X and Y are the 2D coordinates and Z is the intensity.</p>
  
  <p>I plot the data using the scatter function:</p>
  
  <pre><code>markerSize=100;
  scatter(x,y,markerSize,z,'s','fill');
  </code></pre>
  
  <p>I use the options 's' and 'fill' to get filled squares.</p>
  
  <p>My problem is the markerSize value corresponds to the area of the marker, and its unit is points (1/72 of one inch).</p>
  
  <p>The marker size is constant, even if I resize the figure plot. So that the gap between the data points increases when I increase the figure size.</p>
  
  <p>What I would like is a constant marker size which is a constant of the axis unit. For instance, the marker size should be 5x5 (5 in X axis and 5 in Y axis). </p>
  
  <p>Thanks for your help.</p>