title: which.max and assign colnames value to dataframe in R
body: <p>I would like to get the max value and assign the colnames back to the data frame. I tried to loop it. Any suggestions? Thanks</p>
  
  <pre><code>new&lt;-data.frame(id=seq(1:5),att1=rnorm(5,1),att2=rnorm(5,1),att3=rnorm(5,1))
  for (i in 1:nrow(new))
  new$type&lt;-names(which.max(new[i,2:4]))
  
  id       att1       att2      att3 type
  1 -1.1735401  0.1269600 0.6178781 att3
  2  1.9650696 -0.2129732 0.5030030 att3
  3 -0.0901813  4.3937726 1.1886939 att3
  4  0.1719326  1.9478824 2.2497336 att3
  5  2.1359702  2.3347643 2.6607773 att3
  </code></pre>