...of course I meant dof_handler.distribute_dofs(). Does the DoFhandler 
know at this point about the Trinagulation?

Best,
Daniel

Am Dienstag, 20. September 2016 17:58:02 UTC+2 schrieb Daniel Arndt:
>
> Jaekwang,
>
> This seems to be unrelated. Did you setup the Triangulation before calling 
> fe.distribute_dofs()?
>
> Best,
> Daniel
>
> Am Dienstag, 20. September 2016 17:04:02 UTC+2 schrieb JAEKWANG KIM:
>>
>> yes...I tried that before, but I get an error message as follow.. 
>>
>> As you mentioned, I first learn this function in step 7 tutorial. 
>> But the problem is that I want to integrate my vector-valued-solution to 
>> exact-vector-valued solution, while step 7 compares scalar-solution. 
>>
>> Or is there any ways to compare each solution component separately? as it 
>> did in step-7. 
>>
>> I am really thank you for your advice!!!!!
>>
>>
>> An error occurred in line <235> of file 
>> </Users/jaekwangjk/dealii-8.4.1/source/dofs/dof_handler_policy.cc> in 
>> function
>>
>>     static types::global_dof_index 
>> dealii::internal::DoFHandler::Policy::Implementation::distribute_dofs(const 
>> types::global_dof_index, const types::subdomain_id, DoFHandler<dim, 
>> spacedim> &) [dim = 2, spacedim = 2]
>>
>> The violated condition was: 
>>
>>     tria.n_levels() > 0
>>
>> The name and call sequence of the exception was:
>>
>>     ExcMessage("Empty triangulation")
>>
>> Additional Information: 
>>
>> Empty triangulation
>>
>>
>> Stacktrace:
>>
>> -----------
>>
>> #0  2   libdeal_II.g.8.4.1.dylib            0x0000000104ef307c 
>> _ZN6dealii8internal10DoFHandler6Policy14Implementation15distribute_dofsILi2ELi2EEEjjjRNS_10DoFHandlerIXT_EXT0_EEE
>>  
>> + 300: 2   libdeal_II.g.8.4.1.dylib            0x0000000104ef307c 
>> _ZN6dealii8internal10DoFHandler6Policy14Implementation15distribute_dofsILi2ELi2EEEjjjRNS_10DoFHandlerIXT_EXT0_EEE
>>  
>>
>> #1  3   libdeal_II.g.8.4.1.dylib            0x0000000104ef2d97 
>> _ZNK6dealii8internal10DoFHandler6Policy10SequentialILi2ELi2EE15distribute_dofsERNS_10DoFHandlerILi2ELi2EEERNS1_11NumberCacheE
>>  
>> + 39: 3   libdeal_II.g.8.4.1.dylib            0x0000000104ef2d97 
>> _ZNK6dealii8internal10DoFHandler6Policy10SequentialILi2ELi2EE15distribute_dofsERNS_10DoFHandlerILi2ELi2EEERNS1_11NumberCacheE
>>  
>>
>> #2  4   libdeal_II.g.8.4.1.dylib            0x0000000104eb6797 
>> _ZN6dealii10DoFHandlerILi2ELi2EE15distribute_dofsERKNS_13FiniteElementILi2ELi2EEE
>>  
>> + 135: 4   libdeal_II.g.8.4.1.dylib            0x0000000104eb6797 
>> _ZN6dealii10DoFHandlerILi2ELi2EE15distribute_dofsERKNS_13FiniteElementILi2ELi2EEE
>>  
>>
>> #3  5   mystokes                            0x0000000101350e7d 
>> _ZN8MyStokes13StokesProblemILi2EE10setup_dofsEv + 397: 5   mystokes        
>>                     0x0000000101350e7d 
>> _ZN8MyStokes13StokesProblemILi2EE10setup_dofsEv 
>>
>> #4  6   mystokes                            0x0000000101341a52 
>> _ZN8MyStokes13StokesProblemILi2EE3runEv + 386: 6   mystokes                
>>             0x0000000101341a52 _ZN8MyStokes13StokesProblemILi2EE3runEv 
>>
>> #5  7   mystokes                            0x0000000101340aa5 main + 69: 
>> 7   mystokes                            0x0000000101340aa5 main 
>>
>> #6  8   libdyld.dylib                       0x00007fff95b575ad start + 1: 
>> 8   libdyld.dylib                       0x00007fff95b575ad start 
>>
>> #7  9   ???                                 0x0000000000000001 0x0 + 1: 9 
>>   ???                                 0x0000000000000001 0x0 
>>
>>

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