Arena周报的一个小技巧Boolean Expression推荐给大家
Boolean ExpressionsMelanie Barker's avatar
By Melanie Barker, Arena Simulation Consultant
https://www.arenasimulation.com/images/avatars/uploads/avatar_9.jpg
In this issue of Tips and Tricks we’re going to go over Boolean expressions. Boolean expressions are logical statements, such as 2 + 2 == 4, which can be evaluated as either true or false. Within the statements, AND (&&) and OR (||) can be used to build more complex expressions. With the statements built, a truth table like the one below can be developed to understand the potential results of the expressions.
https://www.arenasimulation.com/public/uploads/images/general/Boolean_Table.jpg
When Arena evaluates a Boolean expression, it assigns a value of 0 to false statements and 1 to true statements. Boolean expressions can become useful in Arena when they use variables or attributes. For example, if a part of type 2 needs a longer delay than other part types, this can be done by adding a Boolean expression to evaluate if the part is type 2 and then multiplying the additional delay by the result of that statement.
https://www.arenasimulation.com/public/uploads/images/general/Delay_Image.jpg
Boolean expressions can also use other system variables, like TNOW. If a production line will make better parts as the simulation progresses, the inspection pass rate can be based on the system time. As the time increases, the pass rate increases.
https://www.arenasimulation.com/public/uploads/images/general/Decide_Image.jpg
One final note – if you will be using Boolean expressions to evaluate TNOW or other time-based statements, consider using a function like HoursToBaseTime() to convert the value to the base time units even if the base time units are already in hours. This will protect your statement if the base time units are changed later.
原帖：
utm_campaign=Newsletter&utm_source=hs_email&utm_medium=email&utm_content=25762347&_hsenc=p2ANqtz-_frEKsQ7Cyw_38O2jzVNbmOGFrZFCIHXOBFJ3DxI5E-yWxVvVZ54wTyJTd9aMMwi7G9OljPm4QwI2HAmkiuWbMkBIuIA&_hsmi=25762347 本帖最后由 asax 于 2016-6-30 23:16 编辑
感谢分享，这是一个非常实用的小技巧，灵活运用后可以大量减少不必要 Decide 模块，令可读性更强。
另外，提醒一下，条件判定后一定需要加运算符，否则之后的表达式将简单变成0或1。比如 6 +（1==2）4 只会返回6，6 +（1==2）4 只会返回7. 感谢分享 谢谢 谢谢分享
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