def branin(x,y):
        return (y-(5.1/(4.*pi**2.))*x**2.+6.-5.*x/pi)**2.+\
               10.*(1.-1./(8.*pi))*cos(x)+10.
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/examples/openmdao.examples.expected_improvement/openmdao/examples/expected_improvement/auto_single_ei.py/branin/swapped operands of `-`