If you have the exact same mesh and discretization for u_h and v_h, you can use what Roy pointed out:
system.calculate_norm(u_h - v_h,...) http://libmesh.sourceforge.net/doxygen/classlibMesh_1_1System.php#a3153155431e918a782fabedcaf58e4e6 http://libmesh.sourceforge.net/doxygen/classlibMesh_1_1System.php#a1105a347b46aceaefb97e5e97ce7802d If they are different, I would suggest attaching one to the ExactSolution object http://libmesh.sourceforge.net/doxygen/classlibMesh_1_1ExactSolution.php#a8aaee778ee07a4c872cdba1e4e538329 And use that to compute the error. (There may be better ways, but that's what occurred to me first). On Mon, Oct 6, 2014 at 9:10 AM, Rodrigo Broggi <[email protected]> wrote: > It is almost that, actually I would like to compute the h1norm error > between two approximate functions, not between an exact and an approximate > ( ||uh - vh||_h1). Does this class work also for this case? > Il 06/ott/2014 15:06 "Rodrigo Broggi" <[email protected]> ha scritto: > > > It is almost that, actually I would like to compute the h1norm error > > between two approximate functions, not between an exact and an > approximate > > ( ||uh - vh||_h1). Do this class works also for this case? > > Il 06/ott/2014 14:10 "Paul T. Bauman" <[email protected]> ha scritto: > > > >> Not sure exactly what you're looking for, but there are facilities to > >> compute L2/H1/etc. norms of || u - u_h ||: > >> > >> > http://libmesh.sourceforge.net/doxygen/classlibMesh_1_1ExactSolution.php > >> > >> http://libmesh.sourceforge.net/adaptivity_ex3.php > >> > >> Is this what you had in mind? > >> > >> On Mon, Oct 6, 2014 at 5:39 AM, Rodrigo Broggi <[email protected]> > >> wrote: > >> > >>> Hi, > >>> > >>> A simple question: is there any facility/method to calculate the h1 > norm > >>> of > >>> a solution as there is to calculate te l2_norm of a vector? > >>> > >>> Thanks, > >>> > >>> Rodrigo Broggi > >>> > >>> > ------------------------------------------------------------------------------ > >>> Slashdot TV. Videos for Nerds. Stuff that Matters. > >>> > >>> > http://pubads.g.doubleclick.net/gampad/clk?id=160591471&iu=/4140/ostg.clktrk > >>> _______________________________________________ > >>> Libmesh-users mailing list > >>> [email protected] > >>> https://lists.sourceforge.net/lists/listinfo/libmesh-users > >>> > >> > >> > > ------------------------------------------------------------------------------ > Slashdot TV. Videos for Nerds. Stuff that Matters. > > http://pubads.g.doubleclick.net/gampad/clk?id=160591471&iu=/4140/ostg.clktrk > _______________________________________________ > Libmesh-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/libmesh-users > ------------------------------------------------------------------------------ Slashdot TV. Videos for Nerds. Stuff that Matters. http://pubads.g.doubleclick.net/gampad/clk?id=160591471&iu=/4140/ostg.clktrk _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
