title: Finding intersection of dataframe rownames
body: <p>I have two dataframes. The row names in both are dates. What I want to do is, I want to select all the common rows (having same dates) in both the data frames and create a new data frame having only these common rows.</p>
  
  <p>Of course the individual columns would get appended next to each other.</p>
  
  <p>Can anyone please help??</p>