[R] keep empty subsets using aggregate

Dear all, I am struggling with a small problem. By using aggregate, the empty subsets are removed. I need each empty subset to be 0. Any suggestions will be appreciated. Code: edref = aggregate(rep(1,times=dim(eds)[1]),list(eds[,11], eds[,7], eds[,27]), sum) Thanks in advance,

Re: [R] keep empty subsets using aggregate

On Nov 24, 2009, at 5:03 PM, Fang (Betty) Yang wrote: Dear all, I am struggling with a small problem. By using aggregate, the empty subsets are removed. I need each empty subset to be 0. Any suggestions will be appreciated. Code: edref =