dolfin team mailing list archive

[Jake Ostien <tostien@xxxxxxxxx>]

Hi,

I'd like to use a subset of the solution vector to calculate other 
quantities.  For example, if I have solved for the displacement field on 
a 2D mesh, how can a get at the displacement in the x direction on a 
subset of the mesh.  I was think along the lines of populating a 
std::vector<real> which contains u[0] for a subset (possibly a 
SubDomain) of the mesh.  What I can't figure out is how to access the 
actual values of u[0] inside of DOLFIN.  Of course I can write the 
solution to a file, but I am trying to avoid that post-processing step.  
I have found lots of useful hooks for looking at the reference mesh, but 
not for the solution (and I guess for Functions in general).

Thanks for any help.

-Jake