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 passed to |
---|---|
stringsAsFactors | passed to |
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" ...