title: How can I eliminate quote marks around parameters in R function?
body: <p>Here are the first few lines of an R function that works:</p>
  
  <pre><code>teetor &lt;- function(x,y) {
  
  require("quantmod")
  require("tseries")
  
  alpha &lt;- getSymbols(x, auto.assign=FALSE)
  bravo &lt;- getSymbols(y, auto.assign=FALSE)
  
  t     &lt;- as.data.frame(merge(alpha, bravo))
  
  # ... &lt;boring unit root econometric code&gt;
  
  }
  </code></pre>
  
  <p>When I pass two stock symbols as function parameters, I need to enclose them with quotes:</p>
  
  <pre><code>teetor("GLD", "GDX")
  </code></pre>
  
  <p>I want to be able to simply type:</p>
  
  <pre><code>teetor(GLD, GDX)
  </code></pre>