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R Introduction: Part II

bookSales 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

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

MonthSofaArmchairDining tableDining chairBookshelf
March1621302310
April4039132116
May1121363216

And vector of prices named prices.

SofaArmchairDining tableDining chairBookshelf
34015011545160

Your tasks are:

  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.

Solution

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SectionΒ 1. ChapterΒ 7
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bookSales and Revenue

Swipe to show menu

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

Swipe to start coding

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

MonthSofaArmchairDining tableDining chairBookshelf
March1621302310
April4039132116
May1121363216

And vector of prices named prices.

SofaArmchairDining tableDining chairBookshelf
34015011545160

Your tasks are:

  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.

Solution

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SectionΒ 1. ChapterΒ 7
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