How I can count a a non-numeric value in R?

Question

I have a vector of letters:

v <- c("M", "W", "M", "M", "M", "W", "M", "X", "X", "M", "X", "M", 
"M", "M", "W")

How can I have R count the letters in the vector?

Like:

M 9 
W 3
X 3

Answer 1

You're looking for the table() function.

> table(v)
v
M W X 
9 3 3