# How to define coefficient c in 3 coupling pdes in solving 2D-PDE (PDE toolbox)

3 vues (au cours des 30 derniers jours)
Yue le 22 Déc 2021
Commenté : Yue le 27 Déc 2021
I'm solving 2D-pdes using PDE toolbox, my problem is how to define coefficient c because the third equation (below) is coupled with A and B. I have tried a lot with pde toolbox and refer to this link, but failed to identify c coefficient.
According to this link, I can easily define the first equation and column vector c (first 2 rows), c(1) = c(4) = c, c(2) = c(3) = 0; but I have no idea how to define c in the third equation. Could anybody give me some help?
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### Réponse acceptée

Ravi Kumar le 22 Déc 2021
If you have Symbolic Math Toolbox, then you can use the pdeCoefficients function to get the requried c-coefficient.
Regards,
Ravi
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Yue le 27 Déc 2021
It's useful. Thank you very much!

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