Perhaps this works for creating a new void dataframe:
Newvoid = function (...)
{a=c(...); m=length(a)
initial=matrix(rep(NA,m),byrow=T,ncol=m)
tab=data.frame(initial)
colnames(tab)=a; subset(tab,F)}
Josef Eschgf??ller
Josef Eschgf??ller Dipartimento Matematico Universita' di Ferrara http://felix.unife.it