In R, a matrix is a collection of elements of the same data type (numeric, character, or logical) arranged into a fixed number of rows and columns. Since you are only working with rows and columns, a matrix is called two-dimensional.
You can construct a matrix in R with the matrix() function. Consider the following example:
matrix(1:9, byrow = TRUE, nrow = 3)
In the matrix() function:
1:9 which is a shortcut for c(1, 2, 3, 4, 5, 6, 7, 8, 9).byrow indicates that the matrix is filled by the rows. If we want the matrix to be filled by the columns, we just place byrow = FALSE. nrow indicates that the matrix should have three rows.Construct a matrix with 3 rows containing the numbers 1 up to 9, filled row-wise.
# Construct a matrix with 3 rows that contain the numbers 1 up to 9
# Construct a matrix with 3 rows that contain the numbers 1 up to 9
matrix(1:9, byrow = TRUE, nrow = 3)
test_function("matrix", c("data", "byrow", "nrow"),
incorrect_msg = "Have you correctly created the matrix? Have a look at the assignment, the answer is already given!")
test_output_contains("matrix(1:9, byrow=TRUE, nrow=3)",
incorrect_msg = "There seems to be an issue with the matrix definition. Have a look at the assignment, the answer is already given!")
success_msg("Great! Continue to the next exercise.")
Read the assignment carefully, the answer is already given!