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rcombn

Why doesn't combn() using paste0 as the FUN give me the expected result (r)

I'm trying to create a list of combinations of strings using combn() with paste0 as the function, but all I get back is the matrix of combinations. What am I doing wrong?

Example:

combn(LETTERS[1:5],3, FUN=paste0)

Gives me:

     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] "A"  "A"  "A"  "A"  "A"  "A"  "B"  "B"  "B"  "C"  
[2,] "B"  "B"  "B"  "C"  "C"  "D"  "C"  "C"  "D"  "D"  
[3,] "C"  "D"  "E"  "D"  "E"  "E"  "D"  "E"  "E"  "E"

When what I expected to get was something like:

[1] "ABC" "ABD" "ABE" "ACD" "ACE" "ADE" ...

What did I miss?

Solution

  • Can you use this command and see if it works ? It worked for me.

    combn(LETTERS[1:5],3, FUN=paste0, collapse = "")