title: MATLAB Yahoo data feed error
body: <p>I'm trying to use Yahoo API in MATLAB R2015a to retrieve historical data (prices) for commodities. I can get the price for current date, but not for a historical date range. So for example Last price for CK15.CBT Corn May 15:</p>
  
  <pre><code>clear
  clc
  c = yahoo;
  a = fetch(c,'CK15.CBT','Last');
  disp (a);
  
  d = fetch(c,'CK15.CBT','Last','02/02/15','02/05/15');
  disp (d);
  </code></pre>
  
  <p>Displaying "a" works ok, but "d" returns the following error messages:</p>
  
  <pre><code>Error using yahoo/fetch&gt;isdatafield (line 543)
  Current data field specified but historical data requested.
  
  Error in yahoo/fetch (line 74)
    elseif isdatafield(varargin{1},numinputs)
  
  Error in Untitled (line 7)
  d = fetch(c,'CK15.CBT','Last','02/02/15','02/05/15');
  </code></pre>
  
  <p>Could you please help me how to work with yahoo API in MATLAB to get commodities prices for specified time range? Or do you have a suggestion for any other way how to do it?</p>
  
  <p>Thank you</p>