title: Handling very large matlab file
body: <p>I have a legacy Matlab code on WINDOWS 7 which I can't change. </p>
  
  <p>It reads a CSV input file of the format:</p>
  
  <pre><code>SNo    Date         Qty 
  1      41640        100 
  2      41641        150
  </code></pre>
  
  <p>and does whatever it needs to do.</p>
  
  <p>But I have a new version of CSV file which instead has format:</p>
  
  <pre><code>SNo    Date            Qty  
  1      1/1/2013        100  
  2      1/2/2013        150
  </code></pre>
  
  <p>The CSV files are massive so it is impossible to change the date column to number format by opening CSV file in excel. So, I am thinking about using Matlab to generate a file with modified second column as excel number and make it readable for legacy code.</p>
  
  <p>So, How do I accomplish the above generation of new CSV file to be readable into legacy code.</p>