def setup(self):
pth = os.path.dirname(os.path.abspath(refnx.reflect.__file__))
e361 = RD(os.path.join(pth, 'test', 'e361r.txt'))
sio2 = SLD(3.47, name='SiO2')
si = SLD(2.07, name='Si')
d2o = SLD(6.36, name='D2O')
polymer = SLD(1, name='polymer')
# e361 is an older dataset, but well characterised
structure361 = si | sio2(10, 4) | polymer(200, 3) | d2o(0, 3)
model361 = ReflectModel(structure361, bkg=2e-5)
model361.scale.vary = True
model361.bkg.vary = True
model361.scale.range(0.1, 2)
model361.bkg.range(0, 5e-5)
model361.dq = 5.
# d2o
structure361[-1].sld.real.vary = True
structure361[-1].sld.real.range(6, 6.36)
structure361[1].thick.vary = True
structure361[1].thick.range(5, 20)
structure361[2].thick.vary = True
structure361[2].thick.range(100, 220)
structure361[2].sld.real.vary = True
structure361[2].sld.real.range(0.2, 1.5)
e361.x_err = None
objective = Objective(model361, e361)
self.fitter = CurveFitter(objective, nwalkers=200)
self.fitter.initialise('jitter')
