Faster expand.grid
Only support x and y as characters right now
rxExpandGrid(x, y, type = 0L)
x |
first element (must be character) |
y |
second element (must be character) |
type |
Internal type=0L is traditional expand grid and type=1L is jacobian expand grid (adds symbols) |
Expand grid
Matthew Fidler
##
rxExpandGrid(letters, letters)
## Another fast method; See
## https://stackoverflow.com/questions/10405637/use-outer-instead-of-expand-grid
expand.grid.jc <- function(seq1,seq2) {
cbind(Var1 = rep.int(seq1, length(seq2)),
Var2 = rep.int(seq2, rep.int(length(seq1),length(seq2))))
}
microbenchmark::microbenchmark(rxExpandGrid(letters, letters), expand.grid.jc(letters, letters))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.