How to calculate entropy of particles?

Hello all,

I'm working on a molecular dynamics simulation based on Lennard-Jones
potential. Each particle has a position, a mass, and a velocity.

I know that temperature is the average kinetic energy of all the
particles, so temperature is no problem to calculate.

But, how would you calculate the entropy of the particles?

Any help is appreciated.

-Rick Giuly
If replying by email please use: rgiuly at ucsd dot edu

reference:
http://en.wikipedia.org/wiki/Lennard-Jones_potential
.

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