title: Matching multiple columns on different data frames and getting other column as result
body: <p>I got two big data frames, one (<code>df1</code>) has this structure</p>
  
  <pre><code>   chr    init
  1  12  25289552
  2   3 180418785
  3   3 180434779
  </code></pre>
  
  <p>The other (<code>df2</code>) has this</p>
  
  <pre><code>    V1    V2     V3
  10  1     69094 medium
  11  1     69094 medium
  12  12 25289552 high
  13  1     69095 medium
  14  3 180418785 medium
  15  3 180434779 low
  </code></pre>
  
  <p>What I'm trying to do is to add the column <code>V3</code> of <code>df2</code> to <code>df1</code>, to get the info of the mutation</p>
  
  <pre><code>   chr    init  Mut
  1  12  25289552 high
  2   3 180418785 medium
  3   3 180434779 low
  </code></pre>
  
  <p>I'm trying loading both into R and then doing a for loop using match but it doesn't work. Do you know any special way to do this? I am also open to do using awk or something similar</p>