use-matrix

Install

[dependencies]
use-matrix = "0.0.4"

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.

use-matrix 0.0.4