expand.grid Where order Does Not MattercomboGrid.RdThis function efficiently generates Cartesian-product-like output where order does not matter. It is loosely equivalent to the following:
t = expand.grid(list)
t = t[do.call(order, t), ]
key = apply(t, 1, function(x) paste0(sort(x), collapse = ""))
t[!duplicated(key), ]
comboGrid(..., repetition = TRUE)vectors, factors or a list containing these. (See ?expand.grid).
Logical value indicating whether results should be with or without repetition. The default is TRUE.
If items with different classes are passed, a data frame will be returned, otherwise a matrix will be returned.
## return a matrix
expGridNoOrder = comboGrid(1:5, 3:9, letters[1:5], letters[c(1,4,5,8)])
head(expGridNoOrder)
#> Var1 Var2 Var3 Var4
#> 1 1 3 a a
#> 2 1 3 a d
#> 3 1 3 a e
#> 4 1 3 a h
#> 5 1 3 b a
#> 6 1 3 b d
tail(expGridNoOrder)
#> Var1 Var2 Var3 Var4
#> 539 5 9 c h
#> 540 5 9 d d
#> 541 5 9 d e
#> 542 5 9 d h
#> 543 5 9 e e
#> 544 5 9 e h
expGridNoOrderNoRep = comboGrid(1:5, 3:9, letters[1:5],
letters[c(1,4,5,8)], repetition = FALSE)
head(expGridNoOrderNoRep)
#> Var1 Var2 Var3 Var4
#> 1 1 3 a d
#> 2 1 3 a e
#> 3 1 3 a h
#> 4 1 3 b a
#> 5 1 3 b d
#> 6 1 3 b e
tail(expGridNoOrderNoRep)
#> Var1 Var2 Var3 Var4
#> 401 5 9 c d
#> 402 5 9 c e
#> 403 5 9 c h
#> 404 5 9 d e
#> 405 5 9 d h
#> 406 5 9 e h