title: Converting data into the correct format for INEXT analysis
body: <p>I plan to use the iNEXT function (from the iNEXT package) to analyse potential differences between two pond types. These data are presence/absence and in a sites by species matrix e.g.</p>
  
  <pre><code>Pond.type &lt;- c("A", "A", "A", "B", "B", "B")
  Sample.no &lt;- c(1,2,3,1,2,3)
  Species1 &lt;- c(0,1,1,1,0,0)
  Species2 &lt;- c(0,1,1,0,1,0)
  Species3 &lt;- c(1,1,1,1,0,1)
  Species4 &lt;- c(0,1,0,1,0,0)
  Species5 &lt;- c(1,1,1,0,0,0)
  
  mydata &lt;- cbind.data.frame(Pond.type, Sample.no, Species1, Species2, Species3, Species4, Species5)
  </code></pre>
  
  <p>If I split my data frame into pond types and keep these as matrices I can run the function, e.g. <code>iNEXT(pond.type.a.dataframe)</code>, but then I cannot compare between the different pond types on one plot.</p>
  
  <p>My question is, is there a way to convert my data into the same format as the ciliates example data provided in the iNEXT library? This is given as a list of matrices.</p>