public static int min(int a, int b, int c) {
        return Math.min(Math.min(a, b), c);
    }
@Test
    public void testMin_doubleArrArr() {
        System.out.println("min");
        double[][] A = {
            {0.7220180, 0.07121225, 0.6881997},
            {-0.2648886, -0.89044952, 0.3700456},
            {-0.6391588, 0.44947578, 0.6240573}
        };
        assertEquals(-0.89044952, MathEx.min(A), 1E-7);
    }