R uses functions to perform operations. To run a function called funcname, we type funcname(input1, input2), where the inputs (or arguments) input1 and input2 tell R how to run the function. A function can have any number of inputs. For example, to create a vector of numbers, we use the function c() (for concatenate). Any numbers inside the parentheses are joined together. The following command instructs R to join together the numbers 1, 3, 2, and 5, and to save them as a vector named x. When we type x, it gives us back the vector.

> x <- c(1, 3, 2, 5)
> x
[1] 1 3 2 5

Note that the > is not part of the command; rather, it is printed by R to indicate that it is ready for another command to be entered. We can also save things using = rather than <-:

> x = c(1, 6, 2)
> x
[1] 1 6 2
> y = c(1, 4, 3)

Question

• Use the c() function to store the values 5, 6, 1 and 2 in a variable named x.

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