title: R-finding unmatched column names of data frames
body: <p>I have two large data frames(df1 and df2). I want to combine them using rbind function:</p>
  
  <pre><code>df&lt;-rbind(df1,df2)
  </code></pre>
  
  <p>However, I get an error:</p>
  
  <pre><code>Error in match.names(clabs, names(xi)) : 
  names do not match previous names
  </code></pre>
  
  <p>There more than 100 variables in the data frames. I know most names match. One or two names may not match. How can I find unmatched column names of df1 and df2. I will be very glad for any help. Thanks a lot.</p>