# ODE Event Location detecting events other than zero

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Hariharan MK 2021년 1월 14일
댓글: Hariharan MK 2021년 1월 14일

#### "Use event functions to detect when certain events occur during the solution of an ODE. Event functions take an expression that you specify, and detect an event when that expression is equal to zero. They can also signal the ODE solver to halt integration when they detect an event."

This section is taken from the "ODE Event location" documentation. My question is, whether there is a event function that is able to halt the integration when the expression is equal to a certain value(i.e not zero; <0 or >0)
Does such a function exist?

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### 채택된 답변

Mischa Kim 2021년 1월 14일
Hi Hariharan,
yes it is. You simply define a function that is equal to zero whenever your expression equals a certain value. For example, say you want to track x = 5. In the events function you then use, e.g. y = x - 5. So whenever a zero is detected (y = 0), by definition you know that x = 5.
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Mischa Kim 2021년 1월 14일
Yes, this is possible. There is a good example in our documentation here.
Hariharan MK 2021년 1월 14일

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