Course Content

R Introduction: Part II

1. Matrices

What is a Matrix?matrix() Function Transposing Matrix Indexation Namings Operation with Matrices Sales and Revenue

2. Data Frames

What is a Data Frame?data.frame() Function Columns Accessors Logical Indexing Manipulating Columns Manipulating Rows Data Extraction

3. Lists

What is a List?Namings Extracting List Elements Modifying

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.

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.

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Section 1. Chapter 7

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.

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.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 1. Chapter 7

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.

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.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

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.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Section 1. Chapter 7

Switch to desktop for real-world practiceContinue from where you are using one of the options below