def execute(self):
        x = self.x
        self.f_x = ((6*x-2)**2)*np.sin((2-6*x)*2)
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/examples/openmdao.examples.metamodel_tutorial/openmdao/examples/metamodel_tutorial/cokriging_forrester_example.py/Model.execute/swapped operands of `-`