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scipy.stats.entropy. #. Calculate the Shannon entropy/relative entropy of given distribution (s). If only probabilities pk are given, the Shannon entropy is calculated as H = -sum(pk * log(pk)). If qk is not None, then compute the relative entropy D = sum(pk * log(pk / qk)). This quantity is also known as the Kullback-Leibler divergence.
A measure of disorder in the universe or of the unavailability of the energy in a system to do work. [7] Entropy and disorder also have associations with equilibrium. [8] Technically, entropy, from this perspective, is defined as a thermodynamic property which serves as a measure of how close a system is to equilibrium—that is, to perfect ...
Entropy is just the measure of chaos within a system. The more disordered a system is, the more entropy it has. For example, a neat deck of playing cards has little entropy. However, if you throw the deck in the air, all the cards will go in random directions. Now, the cards have more entropy.
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- Sal Khan
エントロピー（英: entropy ）は、熱力学および統計力学において定義される示量性の状態量である。 熱力学において断熱条件下での不可逆性を表す指標として導入され、統計力学において系の微視的な「乱雑さ」 を表す物理量という意味付けがなされた。
Entropy is one of the important concepts that students need to understand clearly while studying Chemistry and Physics. More significantly, entropy can be defined in several ways and thus can be applied in various stages or instances, such as in a thermodynamic stage, cosmology, and even in economics.
Entropy, a measure of disorder, explains why life always seems to get more, not less, complicated as time goes on. The Order of Disorder. The second law of thermodynamics states that “as one goes forward in time, the net entropy (degree of disorder) of any isolated or closed system will always increase (or at least stay the same).”
Figure 5.6.4: The entropy of a substance increases (ΔS > 0) as it transforms from a relatively ordered solid, to a less-ordered liquid, and then to a still less-ordered gas. The entropy decreases (ΔS < 0) as the substance transforms from a gas to a liquid and then to a solid. Now consider the vapor or gas phase.
