title: Randomize w/no repeats using R
body: <p>How can randomize the following matrix without repetition of the numbers using R??</p>
  
  <pre><code>g=sample(1:28, 28), replace=T)
  HW=matrix(g, ncol=4, byrow=T)
  HW=as.table(HW)
  HW
  </code></pre>