How to generate regular mesh in pde toolbox? (in a mutiple subdomain geometry)

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hi everybody,
I'd like to generate regular mesh on the following domain:
There is 'poimesh' function in the pde toolbox, but it doesn't accept a several subdomain geometry.
So is there any straight way to perform this job?
thanks,

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Bill Greene
Bill Greene 2014-1-14
I guess the first question is, what is the reason for the four subdomains? If the objective is simply to have different properties (pde coefficients) in each subdomain, there is another way to do that. You can generate a single mesh with poimesh, selecting nx and ny so that you have element boundaries at the inner subdomain boundaries. Then you can use a function to define the coefficients in each element based on the x, y location of its centroid.
Bill

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