Which expression correctly states the conventional order of matrix dimensions?

Which expression correctly states the conventional order of matrix dimensions?

• A. Columns x Rows
• B. Rows x Columns
• C. Diagonal length
• D. Rows x Columns

Answer: (D)

Sizes of matrices are described by how many rows and how many columns they have, written as rows × columns. If a matrix has m rows and n columns, its size is m × n. For example, a matrix with 2 rows and 5 columns is 2 × 5. The standard way to express the dimensions is rows first, then columns. The diagonal length is a separate property and depends on both dimensions, not how we name the size. So the conventional expression is Rows × Columns.

Sizes of matrices are described by how many rows and how many columns they have, written as rows × columns. If a matrix has m rows and n columns, its size is m × n. For example, a matrix with 2 rows and 5 columns is 2 × 5. The standard way to express the dimensions is rows first, then columns. The diagonal length is a separate property and depends on both dimensions, not how we name the size. So the conventional expression is Rows × Columns.