title: find max value in one row and return column name
body: <p>This is my data frame. I want to get the highest number in row 3 and return column name i.e result should be "Height"</p>
  
  <pre><code>tt&lt;-"Rows    Weight      Age        Height
      Cats -0.7289964  0.2194702 -2.4674780 
      Dogs  1.0889353  0.3167629 -0.9208548 
      Rats -0.6374692 -1.7249049  0.6567313 
      Mice -0.1348642  0.4507473 -1.7309010"
  
  data &lt;- read.table(text=tt, header=T)
  </code></pre>