Change "data_out.write_vtk 
<https://www.dealii.org/current/doxygen/deal.II/group__Exceptions.html#gacad99726038e4fca7f605fdffb3317e4>
 (output);" 
to "data_out.write_vt 
<https://www.dealii.org/current/doxygen/deal.II/group__Exceptions.html#gacad99726038e4fca7f605fdffb3317e4>
u (output);" 
https://groups.google.com/g/dealii/c/T1ckYL0Le_U/m/54r575TiAwAJ


On Wednesday, November 23, 2022 at 11:16:42 AM UTC+2 
[email protected] wrote:

> Hello Everyone,
>
> I am trying to calculate the gradient of displacement for step 8, for 
> that, I am using the Datapostprocessor Tensor class (same example code 
> which is given in the documentation here - 
> https://www.dealii.org/current/doxygen/deal.II/classDataPostprocessorTensor.html)
>  
> but I am getting the following error:
>
>
>  66%] Linking CXX executable step-8
> [ 66%] Built target step-8
> [100%] Run step-8 with Debug configuration
> Cycle 0:
>    Number of active cells:       256
>    Number of degrees of freedom: 578
>
>
> ----------------------------------------------------
> Exception on processing: 
>
> --------------------------------------------------------
> An error occurred in line <5286> of file <./source/base/data_out_base.cc> 
> in function
>     void dealii::DataOutBase::write_vtk(const 
> std::vector<dealii::DataOutBase::Patch<dim, spacedim> >&, const 
> std::vector<std::__cxx11::basic_string<char> >&, const 
> std::vector<std::tuple<unsigned int, unsigned int, 
> std::__cxx11::basic_string<char, std::char_traits<char>, 
> std::allocator<char> >, 
> dealii::DataComponentInterpretation::DataComponentInterpretation> >&, const 
> dealii::DataOutBase::VtkFlags&, std::ostream&) [with int dim = 2; int 
> spacedim = 2; std::ostream = std::basic_ostream<char>]
> The violated condition was: 
>     std::get<3>(nonscalar_data_range) != 
> DataComponentInterpretation::component_is_part_of_tensor
>
>
>
>
>
>
>
>
>
> *Additional information:     You are trying to use functionality in 
> deal.II that is currently not    implemented. In many cases, this indicates 
> that there simply didn't    appear much of a need for it, or that the 
> author of the original code    did not have the time to implement a 
> particular case. If you hit this    exception, it is therefore worth the 
> time to look into the code to    find out whether you may be able to 
> implement the missing    functionality. If you do, please consider 
> providing a patch to the    deal.II development sources (see the deal.II 
> website on how to    contribute).*
> --------------------------------------------------------
>
> Aborting!
> ----------------------------------------------------
> make[3]: *** [CMakeFiles/run.dir/build.make:71: CMakeFiles/run] Error 1
> make[2]: *** [CMakeFiles/Makefile2:116: CMakeFiles/run.dir/all] Error 2
> make[1]: *** [CMakeFiles/Makefile2:123: CMakeFiles/run.dir/rule] Error 2
> make: *** [Makefile:137: run] Error 2
>
> How to resolve this? 
>
>
> Thanks & Regards,
> Deepika
>
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