title: r sna equiv.clust more than one graph
body: <p>I would like to provide more than one graph as input to the equiv.clust function in the sna package. For example </p>
  
  <pre><code>library(ergm)
  library(sna) 
  
  data(florentine) 
  flobusiness # first relation
  flomarriage # second relation
  
  eq&lt;-equiv.clust(flobusiness)
  b&lt;-blockmodel(flobusiness,eq,h=10)
  plot(b)
  </code></pre>
  
  <p>So far so good. I get the output I expect. However, how do I include both relations in the equiv.clust and blockmodel commands?</p>
  
  <p>According to the Usage in documentation </p>
  
  <pre><code>equiv.clust(dat, g=NULL, equiv.dist=NULL, equiv.fun="sedist",
      method="hamming", mode="digraph", diag=FALSE,
      cluster.method="complete", glabels=NULL, plabels=NULL, ...)
  </code></pre>
  
  <p>where</p>
  
  <pre><code>dat        one or more graphs.
  </code></pre>
  
  <p>Specifically, I am requesting to know how to provide two or more graphs in as the dat part of the argument. Thanks a ton</p>