Flat histogram

Flat histogram Monte Carlo methods bias the system along a macrostate, or order parameter, to observe uniform sampling and recover the free energy as a function of this order parameter.

FlatHistogram contains a Macrostate and a Bias. The Macrostate could be the number of particles or some other quantity such as the energy or a parameter of a model. The method of Bias includes Wang-Landau and Transition-Matrix. Importantly, the Bias computes the probability distribution of the macrostate on the fly, which is related to the free energy.

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