title: What does the function "par" do in R?
body: <p>I am reading R code for k-mean clustering. The first 3 lines of code are:</p>
  
  <pre><code>def.par &lt;- par(no.readonly = T)
  par(mfrow = c(1,3))
  par(oma = c( 5, 0, 3, 0))
  </code></pre>
  
  <p>I read the help manual, but I am still confused. I assumed that it is important for graphics.</p>