Course Content

# R Introduction: Part II

R Introduction: Part II

## Challenge

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.

# Task

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 |

Your tasks are:

- Output the total number of items sold each month.
- Transpose of the
`sellings`

matrix and reassign the result to the`sellings`

variable. - Find out revenue by each good by multiplying
`sellings`

and`prices`

. Save the result to the`income`

variable. - Output the monthly revenues.
- Output the total three months' revenue.

Everything was clear?

Section 1. Chapter 7