title: How to simply count number of rows with NAs - R
body: <p>I'm trying to compute the number of rows with NA of the whole df as I'm looking to compute the % of rows with NA over the total number of rows of the df.</p>
  
  <p>I have already have seen this post: <a href="https://stackoverflow.com/questions/21138927/determine-the-number-of-rows-with-nas">Determine the number of rows with NAs</a> but it just shows a specific range of columns.</p>