title: How to show only the lower triangle in ggpairs?
body: <p>I am using <code>ggpairs</code> to make a pairs plot, but I only want to display the lower triangle. I can make the diagonal and upper triangle blank, but cannot make them go, which leaves an empty row and an empty column which I don't want.</p>
  
  <p>Any suggestions?</p>
  
  <pre><code>library("GGally")
  ggpairs(iris[, 1:4], 
          lower  = list(continuous = "points"),
          upper  = list(continuous = "blank"),
          diag  = list(continuous = "blankDiag")
          )
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/qjYMA.png" rel="noreferrer"><img src="https://i.stack.imgur.com/qjYMA.png" alt="enter image description here"></a></p>