Wang and Landau Algorithm - Sample Code

Sample Code

The following is a sample code of the Wang–Landau algorithm in Python, considering that the proposal is such that

The code considers a "system" which is the underlying system being studied.


currentEnergy = system.randomConfiguration # a random initial configuration while (f > epsilon): system.proposeConfiguration # a proposed configuration is proposed proposedEnergy = system.proposedEnergy # the energy of the proposed configuration computed if (random < exp(entropy-entropy)): # if accepted, update the energy and the system: currentEnergy = proposedEnergy system.acceptProposedConfiguration else: # if rejected system.rejectProposedConfiguration H += 1 entropy += f if (isFlat(H)): # isFlat tests whether the histogram is flat (e.g. 95% flatness) H = 0 f *= 0.5 # refine the f parameter

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