title: Adding and merging two dataframes in R
body: <p>I have two data frames:</p>
  
  <pre><code>&gt; df1
         Long Short
  EURUSD 47295 16057
  GBPUSD 17385  6861
  USDJPY  7146  9369
  USDCHF  2704  5162
  USDCAD  4705 11947
  AUDUSD 13041  6654
  NZDUSD  7184  4000
  
  &gt; df2
         Long Short
  EURUSD  318    408
  GBPUSD  181    276
  USDJPY  217    203
  USDCHF   97     57
  USDCAD  178    121
  AUDUSD  142    202
  NZDUSD   95    138
  </code></pre>
  
  <p>I need the final data frame to be like this:</p>
  
  <pre><code>&gt; Final
         Long   Short
  EURUSD 47613   16465
  
  ...    ...     ...
  
  NZDUSD 7279    4138
  </code></pre>
  
  <p>The merge/concatenate approach isn't working. I appreciate any help.  </p>