title: Why are the return values of these doubles -1.#IND?
body: <p>I have :</p>
  
  <pre><code>double score = cvMatchContourTrees( CT1, CT2, CV_CONTOUR_TREES_MATCH_I1, 0.0 );
          cout&lt;&lt;score&lt;&lt;endl;
  </code></pre>
  
  <p>There are values returned as -1.#IND. Other than that, the positive values are normal, like 1.34543. </p>
  
  <p>Why does this happen? How do I solve it?</p>