I have letters, for example: (abc)
I want your combinations.
I need a vector with output ("a-b" "a-c" "b-c") .
I use the function:
CL<-combn(letters[1:3], 2,simplify = T)
CL.1 <-c(as.vector(CL))
CL.1
But I can not give you that way out.
Can you help me with this exit?
@ toto28,
One way to do what you want is:
First, use the function to obtain the combinations. It is important not to simplify so that each combination appears as an element of a list
CL <- combn(letters[1:3], 2, simplify = FALSE)
Then you use the lapply function in conjunction with the paste function (and its collapse = "-" argument.) This will apply the paste function for each element in the list, ie, for each combination.
CL.1 <- lapply(CL, paste, collapse = "-")
Finally, since lapply also returns a list, it can be converted into a vector with the function unlist
unlist(CL.1)