above_below(edgelist, above)
above = NULL
then all arcs are plotted above (or to the right) If
above
is numeric, it cannot contain both positive
and negative indices. If above
is logical, its
length must equal the number of rows in edgelist
horizontal = TRUE
then arcs can be plotted
above or below the horizontal axis If
horizontal = FALSE
then arcs can be plotted to the
right or left of the vertical axis