是的，我想要得到一个时间衰减的信号。我有两个问题请教一下，1、这个复频率是否可以通过自定义代码来实现；2、我用时间监视器看了一下FDTD内置的平面波，他显示的是一个随时间边振荡边衰减（增加）的一个趋势，这是因为什么
We have an exciting announcement about badges coming in May 2025. Until then, we will temporarily stop issuing new badges for course completions and certifications. However, all completions will be recorded and fulfilled after May 2025.
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