[R] expand.grid overflows?

[francogrex]

>cbn<-as.matrix(expand.grid( rep( list(0:1), 50))) 

Error in rep.int(rep.int(seq_len(nx), rep.int(rep.fac, nx)), orep) : 
  invalid 'times' value
In addition: Warning message:
In rep.int(rep.int(seq_len(nx), rep.int(rep.fac, nx)), orep) :
  NAs introduced by coercion

But I'm only interested in cbn matrix rows where:
cbn<- cbn[rowSums(cbn)==5,] 

Is there a way to evaluate it row by row and only store where the sum is
equal to 5, maybe it reduces cost of computation?
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