title: What is the R function and code for summing a list of characters in R?
body: <p>I am stuck on a question in R, i need to sum a list of characters from the starwars dataset, which is the starwars eye color. The question asks how many different eye colours the character have. The answer is 15, which i derived from a table (table(starwars$eyecolor), but i cannot figure the code to get to 15.</p>