I guess that is because the input mesh is read from a file in adaptivity_ex2,
however the input file does not boundary info.
I am trying to add this to the input file. It looks the format of .xda
files is not well documented.

--Junchao Zhang

On Wed, Jan 20, 2016 at 3:31 PM, Junchao Zhang <junchao.zh...@gmail.com>
wrote:

> Hi,
>   I had a look at introduction_ex4. I found with a DirichletBoundary
> object, the diagonal entries in the matrix for boundary nodes were modified
> to 1 or 2. I want to add this method to adaptivity_ex2.
>   It looks quite easy. I just created a DirichletBoundary object and
> attached it to the system. I commented out some code with #if 0 and ran it
> with *mpirun -n 1 ./.libs/example-dbg -n_timesteps 25 -n_refinements 0
> -output_freq 10 -init_timestep 0*
>   However, I found the dirichlet_bc object did not take effect. After some
> debugging, I found libmesh somehow did not recognize boundary edges and
> nodes.  I don't know what is wrong.
>   I attach my modified adaptivity_ex2.C and the diff to see if someone can
> help on that.
>   Thank you!
>
>
> --Junchao Zhang
>
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