Same as expand.grid but with stringsAsFactors = FALSE by default and with the values of the first argument being changed last, not first.

expandGrid(..., stringsAsFactors = FALSE)

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 3 2 #> .. ..- attr(*, "names")= chr "person" "fruit" #> ..$ dimnames:List of 2 #> .. ..$ person: chr "person=Peter" "person=Paul" "person=Mary" #> .. ..$ fruit : chr "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" ...