  Course Content

# R Introduction: Part I

R Introduction: Part I

##   Operations with Vectors

Vectors in R have one good advantage - flexibility in terms of different operations. For example, if you have two equal length vectors, you can perform an addition/subtraction element-by-element. Also, you can perform all the arithmetic operations with vectors and single numbers - this will operate for each element of a vector. For example, let's create a vector with numbers `10, 20, 30`, add numbers `40, 25, 5` to each element, respectively.  Now, we can multiply each element by 2.  R also provides us with different aggregate/statistical functions. Let's consider the most popular two:

• `sum()` - will return the sum of all the vector elements.
• `mean()` - will return the average value of vector' values. Let's continue the previous example with the sum calculation.  1. Create a vector named `sold` with the respective values of the Items sold column.
2. Assign to the `revenue` variable the result of the multiplication of `prices` and `sold`. Output the value of this vector.
3. Output the sum value of `revenue` elements. 