how to delete duplicate values in a cell array of characters
<p>I have this <code>cell</code> array of <code>char</code>s:</p>

<pre><code>a={'1';'1';'1';'1';'1';'3';'3';'3';'3';'3';'3';'4';'4';'4';'4'};
</code></pre>

<p>and I want to transform it into this:</p>

<pre><code>a={'1';'';'';'';'';'3';'';'';'';'';'';'4';'';'';''};
</code></pre>