def execute(self):
        self.total = self.x[0]**2+self.x[1]**2+self.x[2]**2
calculate the sume of the squares for the list of numbers
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.lib/src/openmdao/lib/drivers/test/test_opt_genetic.py/SphereFunctionArray.execute