title: Matlab error-"Input must be a cell array of strings"...how to get unique values from numeric cell..iff..matrix is of mixed values
body: <p>Here is my code:</p>
  
  <pre><code>A={2,'small','low','unacc';2,'small','med','unacc';2,'small','high','unacc';4,'big','low','unacc';4,'big','high','acc';'more','big','med','acc';'more','big','high','vgood';4,'med','med','acc'};
  </code></pre>
  
  <p>I want to get all unique values from the first column of above matrix</p>
  
  <p><code>uniques(A(:,1))</code> is giving error</p>