Crate use_matrix 

use-matrix

Small 2D, 3D, and 4D matrix primitives for RustUse.
Explicit matrix construction, transpose, determinants, inverses, and products without geometry-specific transforms or higher-level linear algebra algorithms.

Install

[dependencies]
use-matrix = "0.0.5"

What belongs here

use-matrix owns plain f64 matrix primitives and direct matrix operations. The current surface includes Matrix2, Matrix3, Matrix4, matrix-matrix multiplication, matrix-vector multiplication, transpose, trace, determinants, and inverses for 2x2 and 3x3 matrices.

Scalar division follows normal f64 semantics. Dividing by zero yields infinities or NaN instead of panicking.

Neighboring crates

Crate	Responsibility
use-matrix	Matrix primitives and direct matrix operations
use-vector	Vector primitives and vector operations
use-linear	Higher-level linear algebra algorithms and solver-style workflows
use-geometry	Geometric transforms, shapes, points, and spatial algorithms
use-physics	Physical formulas that use matrices

use-matrix intentionally does not add geometry-specific transforms, quaternions, unit-aware matrices, or broader decomposition and solver APIs.

Examples

2x2 determinant

use use_matrix::Matrix2;

let matrix = Matrix2::new(
    1.0, 2.0,
    3.0, 4.0,
);

assert_eq!(matrix.determinant(), -2.0);

2x2 inverse

use use_matrix::Matrix2;

let matrix = Matrix2::new(
    4.0, 7.0,
    2.0, 6.0,
);

let inverse = matrix.inverse().unwrap();
let identity = matrix * inverse;

assert!((identity.m00 - 1.0).abs() < 1e-10);
assert!((identity.m11 - 1.0).abs() < 1e-10);

3x3 identity and multiplication

use use_matrix::Matrix3;

let matrix = Matrix3::new(
    1.0, 2.0, 3.0,
    0.0, 1.0, 4.0,
    5.0, 6.0, 0.0,
);

assert_eq!(Matrix3::IDENTITY * matrix, matrix);

4x4 transpose

use use_matrix::Matrix4;

let matrix = Matrix4::from_rows([
    [1.0, 2.0, 3.0, 4.0],
    [5.0, 6.0, 7.0, 8.0],
    [9.0, 10.0, 11.0, 12.0],
    [13.0, 14.0, 15.0, 16.0],
]);

let transposed = matrix.transpose();

assert_eq!(transposed.m01, 5.0);
assert_eq!(transposed.m10, 2.0);

Status

use-matrix is a concrete pre-1.0 crate in the RustUse math workspace. The API stays small, explicit, and dependency-light so adjacent crates can build on it without pulling in geometry-specific or solver-specific abstractions. Small matrix primitives and operations for RustUse.

Modules

matrix2

Two-dimensional matrix primitives and operations.

matrix3

Three-dimensional matrix primitives and operations.

matrix4

Four-dimensional matrix primitives and operations.

Structs

Matrix2

A 2x2 matrix stored in row-major order.

Matrix3

A 3x3 matrix stored in row-major order.

Matrix4

A 4x4 matrix stored in row-major order.