Macro mat 

macro_rules! mat {
    ($([$($elem:expr),* $(,)?]),* $(,)?) => { ... };
}

Macro to create a Matrix from a nested array.

Example

use numberlab::mat;
use numberlab::structure::matrix::Matrix;

let matrix = mat![
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
];

assert_eq!(matrix, mat![[1, 2, 3], [4, 5, 6], [7, 8, 9]]);
assert_eq!(format!("{}", matrix), "\n 1 2 3\n 4 5 6\n 7 8 9\n");