lastcit.game(n, edges=1, agebins=n/7100, pref=(1:(agebins+1))^-3,
directed=TRUE)
cited.type.game(n, edges=1, types=rep(0, n),
pref=rep(1, length(types)),
directed=TRUE, attr=TRUE)
citing.cited.type.game(n, edges=1, types=rep(0, n),
pref=matrix(1, nrow=length(types), ncol=length(types)),
directed=TRUE, attr=TRUE)lastcit.game and cited.type.game or
matrix (citing.cited.type.game) giving the (unnormalized)
citation probabilities for the different vertex types.ntype