title: Undefined operator '.*' for input arguments of type 'cell'
body: <pre><code>for i=1:3
      S=sum(w(i).*srmap{i});
  end
  </code></pre>
  <p>Code above causes following error:</p>
  <blockquote>
  <p>Undefined operator '.*' for input arguments of type 'cell'.</p>
  <p>Error in test1 (line 23)
  <code>S=sum(w(i).*srmap{i});</code></p>
  </blockquote>
  <p>What is the meaning of this error?</p>
  <p><code>w(i)</code> is a number and <code>srmap{i}</code> is a matrix.</p>