如何随时间更改参数值?

问题描述

我需要在仿真中随时间更改volatile参数的值. IE.在模拟的第一个30s中，此后我需要exp(400ms)，直到60s我需要exp(800ms)，然后在60s exp(2s)之后需要interArrivalTime.

I need to change the value of a volatile parameter over time in a simulation. I.e. in the first 30s of the simulation I need exp(400ms) after that, until 60s I need exp(800ms) and after 60s exp(2s) for interArrivalTime.

推荐答案

对于易失性参数，有一个很简单的技巧.将? :运算符与simTime() NED函数一起使用:

For volatile parameters there is a pretty easy trick. Use the ? : operator along with the simTime() NED function:

**.interArrivalTime = simTime() < 30s ? exponetntial(400ms) : exponential(800ms)

或者甚至可以将它们链接为?:运算符从左到右求值:

or you can even chain them as ?: operator is evaluated left to right:

**.interArrivalTime = exponential(simTime() < 30s ? 400ms : simTime() < 60s ? 800ms : 2s)

将给出:

• exponential(400ms)在30s
以下在30和60s 之间的
• exponential(800ms)60s
之后的
• exponential(2s)

• exponential(400ms) below 30s
• exponential(800ms) between 30 and 60s
• exponential(2s) after 60s

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