title: How to get currency exchange rates in R
body: <p>Are there are any R packages/functions to get exchange rates in real time, e.g. from Google Finance? Would prefer to avoid RCurl or other parsers if something's already out there.</p>
  
  <p>Specifically, given vectors of "from" and "to" currency symbols, I'd like to know the rates. Something like:</p>
  
  <pre><code>IdealFunction(c("CAD", "JPY", "USD"), c("USD", "USD", "EUR"))
  </code></pre>