Question #99875 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/99875
Status: Answered => Open
dbeacham is still having a problem:
Thanks for this - but, could someone give me a quick pointer as to how
to move around the dofmap. Using meshfn.values()/Iterators I can easily
find the edge instances I wish to integrate over, but would like to know
how to convert this knowledge to the indices of the dofs I am
integrating over, so I can extract the relevant submatrix for
computation. [Sorry if my terminology is a bit confused.]
Apart from trying to do extract the ds section of a matrix for pure
boundary integrals, I also want to be able to set the pressure boundary
condition at a single point in a Navier-Stokes calculation, so I would
also be interested to know how the dofmapping scales with general mixed
element spaces (ie Taylor-Hood (P2/P1)). [I assume there is no easier
way of setting a single pressure value than this?]
Thanks, David.
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