title: rgdal package lat/long -> UTM
body: <p>Can someone see what's wrong with this:</p>
  
  <pre><code>library(rgdal)
  
  # Make a two-column matrix, col1 = long, col2 = lat
  xy &lt;- cbind(c(-107), c(26))
  # Convert it to UTM coordinates (in units of meters)
  project(xy, "+proj=utm +zone=51 ellps=WGS84")
  </code></pre>
  
  <p>I understand that Latitude greater than 84 and smaller than 80 are invalid but why do I get:</p>
  
  <pre><code>In project(xy, "+proj=utm +zone=51 ellps=WGS84") :
    1 projected point(s) not finite
  </code></pre>
  
  <p>Thanks!</p>