每次触发规则时,是否可以增加或更改某些变量的值? 我需要在每次规则触发时引入插槽的新值,因为在以下示例中,我将使用此值进行连接: 我有一个将三角洲转换为恒星的电路和规则.对于每个变换产品,都是一个附加节点.对于简单网络,我将其命名为T,但是对于更复杂的网络,我最终得到的是充满T节点的网络,因为每次触发另一个增量的规则时,我都会得到一个T节点.
Is there a way to increment or change value of some variable each time rule fires? I need that for every time rule fires introduce new value of the slot, since I will use this value for connectivity in the following example: I have an electric circuit and rule that transforms delta to star. For every transform product is additional node. For simple network I have named it T, but for more complicated network I end up with network that is full of T nodes, since every time rule is triggered for another delta, I get a T node.
推荐答案Jess具有一种特殊的变量:全局变量.它们在程序的所有部分(包括规则的RHS)中都是可见的.要创建,请使用defglobal,例如
Jess has a special kind of variables: global variable. They are visible in all parts of a program, including the RHSs of the rules. To create, use defglobal, e.g.
(defglobal ?*firecount* = 0)请注意,星号是必需的.
Note that the asterisks are mandatory.
您可以像使用其他任何变量一样使用它们:
You use them just like any other variable:
(++ ?*firecount*) (printout t "fire counter = " ?*firecount* crlf)请注意,甚至reset都不会清除全局变量. -有关其他详细信息,请参阅Jess手册.
Note that not even reset clears a global. - Refer to the Jess manual for additional details.
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每次触发Jess规则时增加或更改变量
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