Suppose I have the following vectors:
n <- c(1:5)
c <- c("A","B","C","D","E")
I build the following array with them:
m <- matrix(c(n,c), ncol = 2)
What is the best way to get a vector like this:
"1 - A", "2 - B", "3 - C", "4 - D", "5 - E"
Do not loop (for / while)?
I can use the
vetor <- paste(m[1,1], m[1,2], sep = " - ")
but only the first element is created:
"1 - A"
Your answer is almost there. Instead of just selecting one row from the array, with the
paste(m[1, 1], m[1, 2], sep = " - ")
Select all at the same time:
paste(m[, 1], m[, 2], sep = " - ")
[1] "1 - A" "2 - B" "3 - C" "4 - D" "5 - E"
In any case, it was not even necessary to create the array m . The R can work directly with the vectors n and c :
paste(n, c, sep = " - ")
[1] "1 - A" "2 - B" "3 - C" "4 - D" "5 - E"