public void Minus_ShouldSucceed()
{
var A = new VectorXD(new double[] { 1, 2, 3, 4 });
var B = new VectorXD(new double[] { 1, 2, 3, 4 });
var addVector = A.Minus(B);
Assert.Equal(new VectorXD(new double[] { 0, 0, 0, 0 }), addVector);
}