title: How to know the size of a variable in MATLAB
body: <p>I have variables in MATLAB, I've checked their class using <code>class()</code> but I also want to know the size that they take in the memory. More accurately, I know that they are of double type, and I want to make sure that they are 32-bit double and not 64-bit.</p>
  
  <p>The version of the MATLAB I'm using is R2009b.</p>