[petsc-users] DMCompositeSetCoupling -- simple example?

[Ellen M. Price]

Hello again!

For my multiphysics problem, I think a DMComposite might make the most
sense, since some variables are only defined in 1d (so any 2d
information is just wasting memory and CPU), while others have a full 2d
distribution. To tell PETSc how the two DMs should be coupled, it looks
like I need DMCompositeSetCoupling, but there are no examples on how to
use it, or even what the parameters of the provided function mean. Does
anyone have a simple example to share? Doesn't have to be full code, a
snippet would be just fine.

Thanks,
Ellen Price