title: as.numeric with comma decimal separators?
body: <p>I have a large vector of strings of the form:</p>
  
  <pre><code>Input = c("1,223", "12,232", "23,0")
  </code></pre>
  
  <p>etc. That's to say, decimals separated by commas, instead of periods. I want to convert this vector into a numeric vector. Unfortunately, <code>as.numeric(Input)</code> just outputs <code>NA</code>.</p>
  
  <p>My first instinct would be to go to <code>strsplit</code>, but it seems to me that this will likely be very slow. Does anyone have any idea of a faster option?</p>
  
  <p>There's an existing question that suggests <code>read.csv2</code>, but the strings in question are not directly read in that way.</p>