Usually when calculating error values I use
VectorTools::integrate_difference(). Still, that gives me an absolute
value. Now I would like to calculate the relative value, i.e.
|u-u_h|_{H^1}/|u|_{H^1}. Based on what I could find until now that means
that I have to create a vector containing the value for the gradients of
the correct solution at each point (using
VectorTools::get_position_vector() and a loop afterwards), which then can
be used to calculate |u|_{H^1} by calling vec.h1_norm(). The problem is,
though, that evaluating the solution at all points could be quite costly.
Thus I was wondering if there are any other functions which could help
speed it up?
--
The deal.II project is located at http://www.dealii.org/
For mailing list/forum options, see
https://groups.google.com/d/forum/dealii?hl=en
---
You received this message because you are subscribed to the Google Groups
"deal.II User Group" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to dealii+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
