Matrix

Matrix is a two-dimensional data structure arranged in rows and columns.

A matrix is often represented as an array of arrays.

For example:

1 2 3
4 5 6
7 8 9

Matrices are useful for:

• Grids
• Images
• Tables of numeric data
• Graph representations
• Linear algebra

Common operations include:

• Reading a cell by row and column
• Iterating over rows
• Iterating over columns
• Transposing rows and columns

In programming, a matrix cell is often accessed with two indexes, such as matrix[row][column].

flowchart TD
    Matrix["matrix"] --> Row0["row 0: 1 2 3"]
    Matrix --> Row1["row 1: 4 5 6"]
    Matrix --> Row2["row 2: 7 8 9"]

Anki

id: matrix-definition deck: Computer Science::Data Structures tags: data-structures matrix

Q: What kind of data naturally fits in a matrix? A: Grid-like data such as images, game boards, spreadsheets, or numeric tables.

id: matrix-indexing deck: Computer Science::Data Structures tags: data-structures matrix

Q: In matrix[row][column], what do the two indexes usually mean? A: The first index chooses the row, and the second index chooses the column.