# How to solve this equation?

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Ilias Bouchkira on 17 Aug 2021
Edited: Walter Roberson on 17 Aug 2021
Hi everyone,
Please can someone tells me how to solve the following equation using a pre-defined solver, such as ode15s;
is there any tutorials, file exchange, youtube video that may help ?
thank you so much in advance,
regards;
##### 2 CommentsShowHide 1 older comment
Ilias Bouchkira on 17 Aug 2021
Thank you so much for sharing the exchange code and for the answer!

Walter Roberson on 17 Aug 2021
Edited: Walter Roberson on 17 Aug 2021
That is a Partial Differential Equation (PDE), and can only be solved with ODE approaches if k_b sigma^b mu_3 delta(L, W) are separable for the three variables, making it really a series of three ODE.
Notice that the left side has a partial with respect to t but the right does not mention t in any obvious way. Either t is hidden (such as in the definition of k_b) or else the derivative with respect to t has to be zero.
Ilias Bouchkira on 17 Aug 2021
Thank you so much for the answer, actually, sigma_b and mu_3 depend on t;

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