Macro numb_rs::symmat

macro_rules! symmat {
    ($($($item : expr), +) ; +) => { ... };
    ($val : expr => $n : expr) => { ... };
}

Creates a symmetrical matrix Note that the symmetrical matrix is of type MatrixS, The aim of this macro and associated struct is for saving space

example:

let a = symmat![
0;
1, 2;
3, 4, 5

];

assert_eq!(a[[1, 2]], a[[2, 1]]);

// equivalent to:
let b = mat![
0, 1, 3;
1, 2, 4;
3, 4, 5
];

assert_eq!(a, b);