title: Import datas in R - different currencies
body: <p>I have to import some datas from Yahoo! finance to R. <br>For example I have to import in R datas about <em>Roche Holding (AG)</em> (<a href="https://it.finance.yahoo.com/q/hp?s=RHO5.DE" rel="nofollow">Roche Yahoo! link</a>) and <em>The Goldman Sachs Group, Inc. (GS)</em> (<a href="https://it.finance.yahoo.com/q/hp?s=GS" rel="nofollow">Goldman Yahoo! link</a>). </p>
  
  <p>My problem is that <em>Roche Holding (AG)</em> datas are in euros and datas about <em>The Goldman Sachs Group, Inc. (GS)</em> are in dollars. </p>
  
  <p>Now to import my datas in R I'm using:</p>
  
  <pre><code>Goldman_Sachs.z = get.hist.quote(instrument="GS", start=date.start,
                                   end=date.end, quote="AdjClose",origin="1970-01-01",
                                   provider="yahoo",compression = "m", retclass="zoo")
  </code></pre>
  
  <p>Is possible to import these datas just in dollars or must I implement a function in R to make this job? </p>
  
  <p>And in the second case how can I choose the exchange rate? </p>