Method index

src/complex/matrix.rs:1485–1494

(&self, pair: (usize, usize))

    type Output = C64;

    fn index(&self, pair: (usize, usize)) -> &C64 {
        let p = self.ptr();
        let i = pair.0;
        let j = pair.1;
        assert!(i < self.row && j < self.col, "Index out of range");
        match self.shape {
            Shape::Row => unsafe { &*p.add(i * self.col + j) },
            Shape::Col => unsafe { &*p.add(i + j * self.row) },
        }
    }
}

/// IndexMut for Complex Matrix (Assign)