an>(<span class='no'>x</span>) <span class='st'>"Cyd"</span> <span class='kw'>%in%</span> <span class='no'>x</span>)</div><div class='output co'>#&gt; $wins
#&gt; 4 x 4 sparse Matrix of class "dgCMatrix"
#&gt;        player2
#&gt; player1 Amy Ben Cyd Dan
#&gt;     Amy .   0.5   .   2
#&gt;     Ben 0.5 .     .   1
#&gt;     Cyd 2.0 .     .   .
#&gt;     Dan .   1.0   1   .
#&gt; 
#&gt; $components
#&gt; $components$`3`
#&gt; [1] "Amy" "Ben" "Cyd" "Dan"
#&gt; 
#&gt; 
#&gt; attr(,"class")
#&gt; [1] "btdata" "l