Same as expand.grid but with stringsAsFactors =
FALSE by default and with the values of the first argument being changed
last, not first.
Arguments
- ...
arguments passed to
expand.grid, but in reversed order- stringsAsFactors
passed to
expand.grid
Examples
persons <- c("Peter", "Paul", "Mary")
fruits <- c("apple", "pear")
# With expand.grid() the values of the first argument change first...
(grid_1 <- expand.grid(person = persons, fruit = fruits))
#> person fruit
#> 1 Peter apple
#> 2 Paul apple
#> 3 Mary apple
#> 4 Peter pear
#> 5 Paul pear
#> 6 Mary pear
#... with expandGrid() they change last.
(grid_2 <- expandGrid(person = persons, fruit = fruits))
#> person fruit
#> 1 Peter apple
#> 2 Peter pear
#> 3 Paul apple
#> 4 Paul pear
#> 5 Mary apple
#> 6 Mary pear
# With expand.grid() character strings are converted to factors by default...
str(grid_1)
#> 'data.frame': 6 obs. of 2 variables:
#> $ person: Factor w/ 3 levels "Peter","Paul",..: 1 2 3 1 2 3
#> $ fruit : Factor w/ 2 levels "apple","pear": 1 1 1 2 2 2
#> - attr(*, "out.attrs")=List of 2
#> ..$ dim : Named int [1:2] 3 2
#> .. ..- attr(*, "names")= chr [1:2] "person" "fruit"
#> ..$ dimnames:List of 2
#> .. ..$ person: chr [1:3] "person=Peter" "person=Paul" "person=Mary"
#> .. ..$ fruit : chr [1:2] "fruit=apple" "fruit=pear"
# ... with expandGrid() character strings are not converted by default.
# Also, there is no attribute "out.attrs" as it is set by expand.grid().
str(grid_2)
#> 'data.frame': 6 obs. of 2 variables:
#> $ person: chr "Peter" "Peter" "Paul" "Paul" ...
#> $ fruit : chr "apple" "pear" "apple" "pear" ...