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[求助] MS-DPD-计算有序参数(order parameter)

P2(cos θ) = 1/2 (3 cos2 θ − 1)

A perfect alignment corresponds to an order parameter of 1, whereas a random orientation gives a value of 0. A typical liquid crystal has an order parameter in the range 0.3 to 0.8. The value generally decreases as the temperature is raised. In particular a sharp drop of the order parameter is observed when the system undergoes a phase transition. The order parameter can be measured experimentally in a number of ways, such as diamagnetism, birefringence, Raman scattering, NMR, and EPR.
怎样由DPD模拟的结果计算cosθ值,众多文献都没说的很清楚如何计算????求大神解答!!!
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