Matrix creation in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a 3x3 matrix filled with numbers 1 to 9.

R Programming

mat <- matrix([1], nrow = 3, ncol = 3)

Drag options to blanks, or click blank then click option'

Arep(1, 9)

Bc(1,9)

Cseq(1, 3)

D1:9

Attempts:

3 left

💡 Hint

Common Mistakes

Using c(1,9) creates a vector with only two numbers, not a sequence.

Using seq(1, 3) creates a sequence from 1 to 3, which is too short.

Using rep(1, 9) repeats 1 nine times, not a sequence.

The matrix() function creates a matrix. Using 1:9 fills it with numbers from 1 to 9.

2fill in blank

medium

Complete the code to create a 2x4 matrix filled by rows with numbers 1 to 8.

R Programming

mat <- matrix(1:8, nrow = 2, ncol = 4, [1] = TRUE)

Drag options to blanks, or click blank then click option'

Abyrow

Bfill

Crowwise

Dbycol

Attempts:

3 left

💡 Hint

Common Mistakes

Using fill or rowwise which are not valid arguments.

Using bycol which is not a valid argument in matrix().

The argument byrow = TRUE fills the matrix by rows instead of by columns.

3fill in blank

hard

Fix the error in the code to create a 3x3 matrix with numbers 1 to 9.

R Programming

mat <- matrix(1:9, nrow = [1], ncol = 3)

Drag options to blanks, or click blank then click option'

A2

B3

C9

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Setting rows to 2 or 1 which does not fit 9 elements properly.

Setting rows to 9 which creates a 9x3 matrix, too large.

The matrix should have 3 rows and 3 columns to fit numbers 1 to 9 properly.

4fill in blank

hard

Fill both blanks to create a 4x2 matrix filled by columns with numbers 1 to 8.

R Programming

mat <- matrix([1], nrow = [2], ncol = 2)

Drag options to blanks, or click blank then click option'

A1:8

B4

C8

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using 8 as number of rows which would not match the 2 columns for 8 elements.

Using 2 as number of rows which is too small.

Use 1:8 for the data and 4 for the number of rows to create a 4x2 matrix.

5fill in blank

hard

Fill all three blanks to create a 3x3 matrix filled by rows with numbers 1 to 9.

R Programming

mat <- matrix([1], nrow = [2], ncol = [3], byrow = TRUE)

Drag options to blanks, or click blank then click option'

A1:9

B3

D9

Attempts:

3 left

💡 Hint

Common Mistakes

Using 9 for rows or columns which creates a 9x9 matrix.

Not setting byrow = TRUE to fill by rows.

The data is numbers 1 to 9, with 3 rows and 3 columns, filled by rows.