[R] Create a data frame of all possible unique combinations of factors

[Q]

Ah!  I like the idea.  Thanks!


jholtman wrote:
> 
> Missed that you wanted to elim duplicated:
> 
>> z <- expand.grid(test,test)
>> # add 'unique' key
>> z$key <- apply(z, 1, function(x)paste(sort(x), collapse=''))
>> str(z)
> 'data.frame':   16 obs. of  3 variables:
>  $ Var1: Factor w/ 4 levels "A","B","C","D": 1 2 3 4 1 2 3 4 1 2 ...
>  $ Var2: Factor w/ 4 levels "A","B","C","D": 1 1 1 1 2 2 2 2 3 3 ...
>  $ key : chr  "AA" "AB" "AC" "AD" ...
>  - attr(*, "out.attrs")=List of 2
>   ..$ dim     : int  4 4
>   ..$ dimnames:List of 2
>   .. ..$ Var1: chr  "Var1=A" "Var1=B" "Var1=C" "Var1=D"
>   .. ..$ Var2: chr  "Var2=A" "Var2=B" "Var2=C" "Var2=D"
> 

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