Sales and Revenue | Matrices

Course Content

# R Introduction: Part II

R Introduction: Part II

## Sales and Revenue

Let's consolidate acquired knowledge with a practical task!

Note

If you want to multiply each element of the row to a specific value (i.e., not one number for all elements), you need to have the condition: the number of rows of the matrix equals the multiplying vector length satisfied.

You have the selling data for a local furniture store stored in the `sellings` matrix.

 Month Sofa Armchair Dining table Dining chair Bookshelf March 16 21 30 23 10 April 40 39 13 21 16 May 11 21 36 32 16

And vector of prices named `prices`.

 Sofa Armchair Dining table Dining chair Bookshelf 340 150 115 45 160

1. Output the total number of items sold each month.
2. Transpose of the `sellings` matrix and reassign the result to the `sellings` variable.
3. Find out revenue by each good by multiplying `sellings` and `prices`. Save the result to the `income` variable.
4. Output the monthly revenues.
5. Output the total three months' revenue.

Everything was clear?

Section 1. Chapter 7

Course Content

# R Introduction: Part II

R Introduction: Part II

## Sales and Revenue

Let's consolidate acquired knowledge with a practical task!

Note

If you want to multiply each element of the row to a specific value (i.e., not one number for all elements), you need to have the condition: the number of rows of the matrix equals the multiplying vector length satisfied.

You have the selling data for a local furniture store stored in the `sellings` matrix.

 Month Sofa Armchair Dining table Dining chair Bookshelf March 16 21 30 23 10 April 40 39 13 21 16 May 11 21 36 32 16

And vector of prices named `prices`.

 Sofa Armchair Dining table Dining chair Bookshelf 340 150 115 45 160

2. Transpose of the `sellings` matrix and reassign the result to the `sellings` variable.
3. Find out revenue by each good by multiplying `sellings` and `prices`. Save the result to the `income` variable.