title: How can I concatenate data frames without losing brackets in column names?
body: <p>I have two dataframes (df1 and df2) with these column names</p>
  
  <pre><code> add (1 unit), add (2 unit), sub
  </code></pre>
  
  <p>second dataframe</p>
  
  <pre><code> add1, sdd1h, Li2c
  </code></pre>
  
  <p>I combine these dataframes using</p>
  
  <pre><code>x &lt;- data.frame(df1,df2)
  </code></pre>
  
  <p>But I am losing the names in df1, where it becomes <code>add.1.unit</code> in the new dataframe. How can I keep the column names as it is?</p>
  
  <p>Note: I don't have to merge by row or anything. These are unrelated columns of same length that needs to be in the same dataframe </p>