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[r2721]: / trunk / course / examples / scipy / example5.3 Maximize Restore History

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>>> def rosen_der(x):
        xm = x[1:-1]
        xm_m1 = x[:-2]
        xm_p1 = x[2:]
        der = zeros(x.shape,x.typecode())
        der[1:-1] = 200*(xm-xm_m1**2) - 400*(xm_p1 - xm**2)*xm - 2*(1-xm)
        der[0] = -400*x[0]*(x[1]-x[0]**2) - 2*(1-x[0])
        der[-1] = 200*(x[-1]-x[-2]**2)
        return der