title: Error in [R] VennDiagram: "Impossible...produces negative area"
body: <p>I am having trouble creating a plot using VennDiagram. Below is my code and error:</p>
  
  <pre><code>venn.plot &lt;- draw.quad.venn(area1 = 412, area2 = 471, area3 = 137, area4 = 1507, n12 = 11, n13 = 1, n14 = 132, n23 = 0, n24 = 183, n34 = 24, n123 = 1, n124 = 143, n134 = 18, n234 = 14, n1234 = 64, category = c("Set1", "Set2", "Set3", "Set4"), fill = c("orange", "red", "green", "blue"), lty = "dashed", cex = 2, cat.cex = 2, cat.col = c("orange", "red", "green", "blue"));
  
  Error in draw.quad.venn(area1 = 412, area2 = 471, area3 = 137, area4 = 1507,  : 
  Impossible: a5  &lt;- n134 - a6 produces negative area
  </code></pre>
  
  <p>I checked my math, but might have missed something? Any thoughts?</p>