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

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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?

Accepted Answer

Ravi Kumar
Ravi Kumar on 22 Dec 2021
If you have Symbolic Math Toolbox, then you can use the pdeCoefficients function to get the requried c-coefficient.

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