title: How to find common rows between two dataframe in R?
body: <p>I would like to make a new data frame which only includes common rows of two separate data.frame.
  example:</p>
  
  <p>data.frame 1</p>
  
  <pre><code>1 id300
  2 id2345
  3 id5456
  4 id33
  5 id45
  6 id54
  </code></pre>
  
  <p>data.frame2</p>
  
  <pre><code>1 id832
  2 id300
  3 id1000
  4 id45
  5 id984
  6 id5456
  7 id888
  </code></pre>
  
  <p>So I want my output be:</p>
  
  <pre><code>1 id300
  2 id45
  3 id5456
  </code></pre>
  
  <p>any suggestion please?</p>