title: With the R package xlsx, is it possible to set na.strings when reading an Excel file?
body: <p>I'm reading in an Excel file using <code>read.xlsx</code>, and I would like to set na.strings as you can with <code>read.table</code>. Is this possible? It doesn't work to just add na.strings to the call like this:</p>
  
  <pre><code>Data &lt;- read.xlsx("my file.xlsx", sheetName = "MyData", na.strings = "no info")
  </code></pre>
  
  <p>Is there some other way to do it?</p>