Did you mean "linear_elastic_probes.html" instead of "linear_elastic_tractions.html" example? I found the "linear_elastic_probes.html" very useful example for my purposes to probe a solution in the given (x, y, z) points. Also the documentation "src/sfepy/fem/probes.html" gives all necessary information to help me implement what I want to do. Thank you!
But, despite this, could you tell me more about low-level way to evaluate a variable in the given (x, y, z) point?
On Sunday, August 26, 2012 12:47:50 AM UTC+4, Robert Cimrman wrote:
On 08/25/2012 05:45 PM, Alec Kalinin wrote:
Dear SfePy users,
Is it possible to evaluate a solution not only in the FEM mesh node, but
any arbitrary point in the domain with the given (x, y, z) coordinates?
Yes, it is possible. Either, you could use a probe as described in the Primer  - the available probes are described in . Or, you could directly evaluate a variable in given points - this is a bit low-level operation, but I could provide you instructions, if the probes are not enough for you.
For example, consider Dirichlet problem for Poisson equation. We apply essential boundary conditions on the surface nodes and after the problem has been solved we have the solution vector, i.e. vector of values in
FEM mesh nodes. But I want to know the solution in point v(x, y, z) that
not FEM mesh node. What is the best way to obtain solution in this point
Sincerely, Alec Kalinin
 doc-devel/examples/linear_elasticity/linear_elastic_tractions.html  http://sfepy.org/doc-devel/src/sfepy/fem/probes.html