It is very common to want to extract one or more elements from a vector. For this, we use a technique called **indexing** or **subsetting**. After the vector, we put an integer in square brackets (`[]`) called the **subscript operator**. This instructs R to return the element at that index. The indices (plural for index, in case you were wondering!) for vectors in R start at 1 and stop at the length of the vector:

> our.vect[1] # to get the first value[1] 8> # the function length() returns the length of a vector > length(our.vect)[1] 7> our.vect[length(our.vect)] # get the last element of a vector[1] 9

Note that in the preceding code, we used a function in the subscript operator. In cases like these, R evaluates the expression in the ...