title: How to remove vector with repeating elements from R data.frame?
body: <pre><code>dat = data.frame(do.call("rbind", list(c(1.5, 1.5, 1.5, 1.5, 1.5), c(1, 2, 3, 4, 5),
                             c(3, 3, 3, 3, 3), c(1, 2, 2, 3, 4))))
  
  dat
     X1  X2  X3  X4  X5
  1 1.5 1.5 1.5 1.5 1.5
  2 1.0 2.0 3.0 4.0 5.0
  3 3.0 3.0 3.0 3.0 3.0
  4 1.0 2.0 2.0 3.0 4.0
  </code></pre>
  
  <p>Here I'd like to remove rows 1 and 3 because the elements in those rows are the same. I want the resulting <code>data.frame</code> to just consist of rows 2 and 4. What's a quick way to do this without writing a loop?</p>