Thank you ! 

You just pointed out exact problem that my code had!

I was not taking into constraints when I make new sparsity pattern! 


*  DoFTools::make_sparsity_pattern(dof_handler,*

*                                    dsp,*

*                                    constraints,*

*                                    /*keep_constrained_dofs = */ false);*


2017년 3월 20일 월요일 오후 1시 3분 50초 UTC-4, Wolfgang Bangerth 님의 말:
>
> On 03/20/2017 10:58 AM, Jaekwang Kim wrote: 
> > 
> > I tried to assert assemble function as you suggested, but I didn't 
> > receive any error message. 
> > 
> > What make me more confuse me is the code is working with global 
> refinement. 
>
> Then are you building the sparsity pattern taking into account hanging 
> node constraints? Take a look how that is done in step-6, for example. 
>
> Best 
>   W. 
>
> -- 
> ------------------------------------------------------------------------ 
> Wolfgang Bangerth          email:                 bang...@colostate.edu 
> <javascript:> 
>                             www: http://www.math.colostate.edu/~bangerth/ 
>

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