title: multiple plots in one RStudio
body: <p>I am looking to plot the top 20 games in terms of their sales for 4 categories (EU, JP, NA and other) on the one plot.</p>
  
  <p>I pulled the top 20 for each using the below code:</p>
  
  <pre><code># creating a scatterplot of the top 20 in each category
  top20NA &lt;- head(sort(games$NA_Sales,decreasing=TRUE), n = 20)
  top20EU &lt;- head(sort(games$EU_Sales,decreasing=TRUE), n = 20)
  top20JP &lt;- head(sort(games$JP_Sales,decreasing=TRUE), n = 20)
  top20other &lt;- head(sort(games$Other_Sales,decreasing=TRUE), n = 20)
  </code></pre>
  
  <p>i then tried to run the below block but it just seems to run the last plot:</p>
  
  <pre><code>plot(top20NA, col ="Blue")
  plot(top20EU, col = "Black")
  plot(top20JP, col = "Yellow")
  plot(top20other, col = "Green")
  </code></pre>
  
  <p>x axis should be ranking and y axis should be sales</p>
  
  <p>any ideas? Thanks in advance</p>
  
  <p><a href="https://i.stack.imgur.com/0tFfg.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0tFfg.jpg" alt="plot"></a></p>