title: R QQ-plot not showing
body: <p>doing an online course and i was given the following task:</p>
  
  <pre><code>load("skew.RData")
  </code></pre>
  
  <p>Using QQ-plots, compare the distribution of each column of the matrix to a normal. That is, use qqnorm() on each column. To accomplish this quickly, you can use the following line of code to set up a grid for 3x3=9 plots. ("mfrow" means we want a multifigure grid filled in row-by-row. Another choice is mfcol.)</p>
  
  <pre><code>par(mfrow = c(3,3))
  </code></pre>
  
  <p>Then you can use a for loop, to loop through the columns, and display one qqnorm() plot at a time. You should replace the text between ** with your own code.</p>
  
  <pre><code>for (i in 1:9) {
    **put your qqnorm call here**
  }
  </code></pre>
  
  <p>i have as a file calld dat, something with 9 columns and around 1000 rows.</p>
  
  <p>Can somone give me a hint how the QQ-plot command could look like?</p>