Matrices
Matrix
A rectangular array of numbers arranged in rows and columns.
| English | Matrix |
|---|---|
| Bahasa Melayu | Matriks |
| 中文 | 矩阵 |
How it is used
If A = (2 1; 3 4) and B = (1 0; 5 2), both are 2×2 matrices, so you can add them: A + B = (3 1; 8 6), adding element by element in the same position.
Where it shows up in SPM
The opening idea of the Matrices chapter (Form 5). In Paper 1 you identify a matrix or its order; in Paper 2 you set up a matrix to represent real data, such as prices or quantities, before adding, subtracting or multiplying.
Don't confuse it with
Frequently asked questions
Can I add any two matrices together?
No. Two matrices can only be added or subtracted if they have the same order, for example both 2×2.
You then add the numbers in matching positions. A 2×2 and a 2×3 matrix cannot be added because their shapes differ.
How do I say the size of a matrix?
State the number of rows first, then columns, as rows × columns. A matrix with 2 rows and 3 columns is a 2×3 matrix.
Rows go across; columns go down. Always keep this order, since a 2×3 is different from a 3×2 matrix.