title: The R %*% operator
body: <p>What is this? I can't find help by using <code>?</code>. (Sorry for being dumb)</p>
  
  <pre><code>&gt; 1%*%1
       [,1]
  [1,]    1
  &gt; 10%*%10
       [,1]
  [1,]  100
  &gt; c(1:2)%*%c(1:2)
       [,1]
  [1,]    5
  </code></pre>