random sampling

a. Follow-ups to Session 13 • Comment on the codes from Session 13. The codes used in Session 13 use various " tricks " or shortcuts to make them more compact. In general, I don't recommend coding this way (so these codes should be rewritten!). For example, the choice of energy units is exploited so that energies are integers and therefore can be used as array indices. But if we added an external field, this would no longer work, so a different approach should be implemented. Another example is the next configuration function, which uses recursion (i.e., the function calls itself) to count upward in binary. This is clever, but really hard to decipher! • Recap of energy distributions figure.