title: How to find the amount of positive numbers
body: <p>I am new in the world of <code>R</code>, and have a rather easy questions, however it troubles me.</p>
  
  <p>I have a load of numbers: </p>
  
  <pre><code>abc=rnorm(100, mean=0, sd=1)
  </code></pre>
  
  <p>I want to find out how many of these numbers which are positive. I tried:</p>
  
  <pre><code>length(which(abc&gt;0) 
  </code></pre>
  
  <p>but that didn't work. Any suggestions?</p>