title: Use gsub remove all string before first white space in R
body: <p>I have a data frame like this:</p>
  
  <pre><code>name         weight
  r apple         0.5
  y pear          0.4
  y cherry        0.1
  g watermelon    5.0
  pp grape        0.5
  y apple pear    0.4
  ...  ...
  </code></pre>
  
  <p>I would like to remove all characters before the first white space in the name column.  Can anybody give me a favor? Thank you!</p>