title: select command not working in R even after installing the library dplyr
body: <p><code>Error message : could not find function "select"</code></p>
  
  <p>After installing the package <a href="/questions/tagged/dplyr" class="post-tag" title="show questions tagged &#39;dplyr&#39;" rel="tag">dplyr</a> which contains the <code>select</code> function for R,
  this error isn't expected but still i am getting this error.
  I want to select a particular column of the dataset but the dollar sign operator is also not working.</p>