title: Drop number of columns by vector of column names in R
body: <p>I was wondering how it was possible to drop a number of columns from a dataframe/datatable using a vector of column names within a pipeline. Up until now I'm trying something like this:</p>
  
  <pre><code>del_cols &lt;- c("colname 1", "colname 2", "colname 4")
  
  new_data &lt;- old_data %&gt;%
       select_(del_cols)
  </code></pre>
  
  <p>However, this is not working. I also tried defining the columns to be removed as follows:</p>
  
  <pre><code>del_cols &lt;- c("colname 1, colname 2, colname 4")
  </code></pre>
  
  <p>But this turned up to fail as well.</p>
  
  <p>Any help would be appreciated!</p>