TheAlgorithms/Python · error · ValueError

Matrix size must be a positive integer.

Error message

Matrix size must be a positive integer.

What it means

Error "Matrix size must be a positive integer." thrown in TheAlgorithms/Python.

Source

Thrown at matrix/matrix_based_game.py:61

--------
The script outputs the total score after processing all moves.

Usage:
-------
Run the script and provide the required inputs as prompted.

"""


def validate_matrix_size(size: int) -> None:
    """
    >>> validate_matrix_size(-1)
    Traceback (most recent call last):
        ...
    ValueError: Matrix size must be a positive integer.
    """
    if not isinstance(size, int) or size <= 0:
        raise ValueError("Matrix size must be a positive integer.")


def validate_matrix_content(matrix: list[str], size: int) -> None:
    """
    Validates that the number of elements in the matrix matches the given size.

    >>> validate_matrix_content(['aaaa', 'aaaa', 'aaaa', 'aaaa'], 3)
    Traceback (most recent call last):
        ...
    ValueError: The matrix dont match with size.
    >>> validate_matrix_content(['aa%', 'aaa', 'aaa'], 3)
    Traceback (most recent call last):
        ...
    ValueError: Matrix rows can only contain letters and numbers.
    >>> validate_matrix_content(['aaa', 'aaa', 'aaaa'], 3)
    Traceback (most recent call last):
        ...
    ValueError: Each row in the matrix must have exactly 3 characters.

View on GitHub (pinned to f5988cc097)

Solutions

1. Pass a positive integer matrix size.

When it happens

Trigger: Thrown at matrix/matrix_based_game.py:61 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of TheAlgorithms/Python@f5988cc097 (2026-08-14). Data as JSON: /api/errors/ae0b4919f607e7a2. Report an issue: GitHub.