2—1 信息的度量——熵 信息的定量描述——信息量。首先应该明确信息是可测的,而其取值与信息内容和涵义无关。其次是信息与某事件可能出现的状态数n以及各种状态x_i的发生概率p_i有关。 设事件的状态集为X,状态所对应的概率空间为P,P所对应的信息函数为I,则有 2-1 Information Metrics - Quantitative Description of Entropy Information - Information Amount. First of all, it should be clear that the information is measurable, and its value has nothing to do with the content and meaning of the information. Secondly, the information is related to the number of possible states n of an event and the probability of occurrence p_i of various states x_i. Let the state set of events be X, the probability space corresponding to the state is P, and the information function corresponding to P is I, then there is