title: R plot rotated points or filled arrowhead
body: <p>is there a way in basic R to modify the pch point types by just rotating them? I´d need a pointing-right triangle (with its base parallel to the y axes).</p>
  
  <pre><code>x &lt;- runif(5)
  y &lt;- runif(5)
  plot(x, y, pch = 17, cex = 2)   #is there a parameter for rotation?
  </code></pre>
  
  <p>Alternatively, how could I change the arrowhead in arrows() with a filled triangle?</p>
  
  <pre><code>plot(x, y, pch = "")
  arrows(x, y, x-0.03, y, code = 1)   #is there a parameter for the arrowhead symbol?
  </code></pre>
  
  <p>thanks for your help!</p>
  
  <p>Sara</p>