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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