title: Saving a kdb+ "unmappable" table to disk
body: <p>I have a table in my <em>rdb</em> (running the standard r.q) that includes a nested list of floats of the form: </p>
  
  <pre><code>(((1.a 1.b);(2.a 2.b);...;(N.a N.b));((N+1.a N+1.b);...;(N+X.a N+X.b)))
  </code></pre>
  
  <p>When <code>.u.end</code> is called I get an "unmappable error". </p>
  
  <p>Is there anyway to save deeply nested data to an <em>hdb</em>?</p>