title: strcmp files - Very large file size output
body: <p>I'm reading in a csv file that is about 80MB - <code>data_O3</code>. It's about 250,000 x 5 in size. I created <code>E</code>, which is a little bit larger because it has all the days (<code>data_O3</code> is missing some days). I want to compare the two so that if the date (saved in variable <code>d3</code>) and siteID (<code>d4</code>) are the same, the data point (column 5) is placed in <code>E</code>.</p>
  
  <pre><code>for j = 1:size(data_O3,1) 
      E(strcmp(d3,data_O3{j,3})&amp;d4 == data_O3{j,4},5) = data_O3(j,5);
  end
  </code></pre>
  
  <p>This script works fine, but for some reason, running it takes longer than expected. I've run the same code for other data that were only slightly smaller with no problem. Is this an issue with the <code>strcmp</code> code or something else?</p>
  
  <p>The script and files used can be found here: <a href="https://www.dropbox.com/sh/7bzq3m1ixfeuhu6/i4oOvxHPkn" rel="nofollow">https://www.dropbox.com/sh/7bzq3m1ixfeuhu6/i4oOvxHPkn</a></p>