Hi Pushkar,
That error is usually a result of having a sparse matrix with no sparsity
pattern attached to it. Could you please verify that you attach sparsity
patterns to all the matrices you use in assembly?
Best,
David Wells
________________________________
From: dealii@googlegroups.com <dealii@googlegroups.com> on behalf of
pushkar...@gmail.com <pushkarpandi...@gmail.com>
Sent: Wednesday, May 5, 2021 12:16 AM
To: deal.II User Group <dealii@googlegroups.com>
Subject: [deal.II] Problem with Debugging step-26 program
Deal deal.II community
In my attempt to simulate the additive manufacturing process, I modified the
step-26 program to reproduce the results in which I ran into an error which
produces the output as :
$ make run
Consolidate compiler generated dependencies of target step-26
[ 66%] Built target step-26
[100%] Run step-26 with Debug configuration
***Time step 0 at t=0
===========================================
Number of active cells: 1024
Number of degrees of freedom: 99
--------------------------------------------------------
An error occurred in line <367> of file
</usr/local/include/deal.II/base/smartpointer.h> in function
T* dealii::SmartPointer<T, P>::operator->() const [with T = const
dealii::SparsityPattern; P = dealii::SparseMatrix<double>]
The violated condition was:
t != nullptr
Additional information:
(none)
Stacktrace:
-----------
#0 ./step-26: Step26::HeatEquation<2>::assemble_system()
#1 ./step-26: Step26::HeatEquation<2>::run()
#2 ./step-26: main
--------------------------------------------------------
make[3]: *** [CMakeFiles/run.dir/build.make:71: CMakeFiles/run] Aborted (core
dumped)
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
I tried to debug with gdb but coudnt make track the error. So any help in this
regard to debug the code will prove beneficialMoreover,I have attached
step-26.cc file which was modified.
Sincerely
Pushkar
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