title: deleting variables from a .mat file
body: <p>Does anyone here know how to <em>delete</em> a variable from a matlab file? I know that you can add variables to an existing matlab file using the <code>save -append</code> method, but there's no documentation on how to delete variables from the file.</p>
  
  <p>Before someone says, "just save it", its because I'm saving intermediate processing steps to disk to alleviate memory problems, and in the end there will be almost 10 GB of intermediate data per analysis routine. Thanks!</p>