title: Remove quotes ("") from a data.frame in R
body: <p>I have a data.frame with several columns, all of them are character class. All values are in double quotes, I would like to remove those quotes.</p>
  
  <p>Example</p>
  
  <pre><code>df1      df2
  "1203"   "Name1"
  "2304"   "Name2"
  </code></pre>