计算有事件的 ODE 的符号解
用 DSolve 解有状态相依事件的常微分方程（ODE）.
| In[1]:= |  X |
| Out[1]= |  |
这是一个弹力球系统.
| In[2]:= |  X |
| Out[2]= |  |
当事件发生时停止对 ODE 的积分.
| In[3]:= |  X |
| Out[3]= |  |
当事件发生一次后将其删除.
| In[4]:= |  X |
| Out[4]= |  |
| In[5]:= |  X |
| Out[5]= |  |
指定一个变量并在事件间维持其值不变.
| In[6]:= |  X |
| Out[6]= |  |
| In[7]:= |  X |
| Out[7]= |  |
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