# how to solve a non linear ode equation ?

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hamza karim 2021년 9월 14일
댓글: Bjorn Gustavsson 2021년 9월 16일
Hello,
i have the following ODE that i want to solve where k_r and kaq are constant values.
i am really stuck on what approach should i take to implement the equation in matalb, i have tried to linearize the equation using odetovectorfield function to solve it using ode45 or another solver but it won't work since the equation is not a quasi-linear differential equation as explained in the function description.
I would be grateful for any guidance or help

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### 답변(1개)

Bjorn Gustavsson 2021년 9월 14일
You have a quadratic equation for dCAdt, solve that one as a standard quadratic equation, you will end up with two solutions for dCAdt that will be possible to solve. If you're somewhat lucky you might end up with solutions that are simple enough to solve analyticalls. Depending on your initial condition you might have to discard one of the solutions and select one to proceed with.
HTH
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Bjorn Gustavsson 2021년 9월 16일
Regarding units again: you might have forgotten to correct reaction-rates from cm³/s to m³/s or some such easy to forget step. That would give you something like a 6 orders of magnitude change in reaction-rates, but would be hard to capture with dimensional analysis...

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