On Friday October 8 2010 08:39:14 Sungick Kim wrote: > Question #128351 on DOLFIN changed: > https://answers.launchpad.net/dolfin/+question/128351 > > Status: Answered => Open > > Sungick Kim is still having a problem: > Thank you very much for your replies, Anders and Johan. > > Q = FunctionSpace(mesh, "DG", 1) > u1 = Function(Q) > u = u1('-') > velocity = Expression(('u','0','0')) > > As you can see above, 'u' is not a scalar but a scalar field. In this > case, how can I create an expression for the velocity vector? I intend > to use 'grad(velocity)' for later formulation.
If I am not totaly off you should be able to do: velocity = as_vector(u, 0, 0) Btw you can take a look in demo/undocumented/tensor-weighted-poisson/python to get a better feeling for the as_vector/as_matrix funtion. Johan _______________________________________________ Mailing list: https://launchpad.net/~dolfin Post to : [email protected] Unsubscribe : https://launchpad.net/~dolfin More help : https://help.launchpad.net/ListHelp
