When you look at an object’s contents, R shows you the
starting number of the element. Try typing the following. Press
the ENTER key after you type the number 9;
R will prompt you with a plus sign +, indicating
“you need to type more.”
> try.me <- c(1, 2, 3, 4, 5, 6, 7, 8, 9, + 10, 11, 12, 13, 14, 15)
(notice that you can put a dot in the name of an object to separate words.) Now set your R console window to be really narrow, and type:
> try.me
[1] 1 2 3 4 5 6 7 8 9 10
[11] 11 12 13 14 15
Because your output took more than one line, R split it up and told you that the first line starts with the first element [1], and the second line starts with the eleventh element [11] of the vector. Depending on the width of your window, your split point will probably be different.
If you need a series of consecutive numbers, R has a quick and easy shortcut using the colon to indicate a range of numbers. Widen your window again, and try this:
> series <- c(20:30) > series [1] 20 21 22 23 24 25 26 27 28 29 30
So that means you could have as easily typed:
> try.me <- c(1 : 15)