dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Mon, Oct 05, 2009 at 11:18:19AM +0200, Kristian Oelgaard wrote:
>
> Hi,
>
> I'm trying to update my plasticity solver to use the latest version of DOLFIN
> and I ran into a problem with the new design of Function/Expression etc.
> I get the following error:
>
> terminate called after throwing an instance of 'std::runtime_error'
>   what():  evaluate_basis() is not supported for QuadratureElement
>
> Program received signal SIGABRT, Aborted.
> [Switching to Thread 0xb6a436d0 (LWP 21130)]
> 0xb7f15430 in __kernel_vsyscall ()
> (gdb) where
> #0  0xb7f15430 in __kernel_vsyscall ()
> #1  0xb6b726d0 in raise () from /lib/tls/i686/cmov/libc.so.6
> #2  0xb6b74098 in abort () from /lib/tls/i686/cmov/libc.so.6
> #3  0xb6d8f8f8 in __gnu_cxx::__verbose_terminate_handler () from
> /usr/lib/libstdc++.so.6
> #4  0xb6d8d7d5 in ?? () from /usr/lib/libstdc++.so.6
> #5  0xb6d8d812 in std::terminate () from /usr/lib/libstdc++.so.6
> #6  0xb6d8d94a in __cxa_throw () from /usr/lib/libstdc++.so.6
> #7  0x080d6b39 in strain2d_0_finite_element_0::evaluate_basis (this=0x9ba9038,
> i=0, values=0x9bad220, coordinates=0xbfb2f3c8, c=@0xbfb2f5d8)
>     at
> /home/oelgaard/fenics_projects/fenics_apps/fenics-plasticity/demo/forms/2Dlinear_QE_forms/Strain2D.cpp:495
> #8  0xb7cf2d55 in dolfin::Function::eval (this=0xbfb306b4, values=0xbfb2f3b0,
> x=0xbfb2f3c8, ufc_cell=@0xbfb2f5d8, cell_index=0) at
> ./dolfin/fem/FiniteElement.h:53
> #9  0xb7cf9e77 in dolfin::Function::eval (this=0xbfb306b4, values=0xbfb2f3b0,
> data=@0xbfb306fc) at dolfin/function/Function.cpp:275
> #10 0xb7d00c77 in dolfin::GenericFunction::evaluate (this=0xbfb306f8,
> values=0xbfb2f3b0, coordinates=0xbfb2f3c8, cell=@0xbfb2f5d8)
>     at dolfin/function/GenericFunction.cpp:35
> #11 0x080bc905 in plas2d_1_finite_element_2::evaluate_dof (this=0x9bb7558, i=0,
> f=@0xbfb306f8, c=@0xbfb2f5d8)
>     at
> /home/oelgaard/fenics_projects/fenics_apps/fenics-plasticity/demo/forms/2Dlinear_QE_forms/Plas2D.cpp:10433
> #12 0xb7d00f4c in dolfin::GenericFunction::restrict_as_ufc_function
> (this=0xbfb306f8, w=0x9bb7c38, element=@0x9bb7580, dolfin_cell=@0xbfb2f520,
>     ufc_cell=@0xbfb2f5d8, local_facet=-1) at ./dolfin/fem/FiniteElement.h:61
> #13 0xb7cf2f8e in dolfin::Function::restrict (this=0xbfb306b4, w=0x9bb7c38,
> element=@0x9bb7580, dolfin_cell=@0xbfb2f520, ufc_cell=@0xbfb2f5d8,
> local_facet=-1)
>     at dolfin/function/Function.cpp:490
> #14 0xb7ceb0ce in dolfin::UFC::update (this=0xbfb2f5b0, cell=@0xbfb2f520) at
> dolfin/fem/UFC.cpp:212
> #15 0xb7cb2e85 in dolfin::Assembler::assemble_cells (A=@0x9bbb838,
> a=@0xbfb30b18, ufc=@0xbfb2f5b0, domains=0x0, values=0x0) at
> dolfin/fem/Assembler.cpp:159
> #16 0xb7cb3475 in dolfin::Assembler::assemble (A=@0x9bbb838, a=@0xbfb30b18,
> cell_domains=0x0, exterior_facet_domains=0x0, interior_facet_domains=0x0,
>     reset_sparsity=<value optimized out>, add_values=<value optimized out>) at
> dolfin/fem/Assembler.cpp:115
> #17 0xb7cb35e2 in dolfin::Assembler::assemble (A=@0x9bbb838, a=@0xbfb30b18,
> reset_sparsity=<value optimized out>, add_values=<value optimized out>)
>     at dolfin/fem/Assembler.cpp:50
> #18 0xb7eef1f8 in dolfin::PlasticityProblem::F (this=0xbfb2f814, b=@0x9bbb838,
> x=@0x9bb0e48) at src/PlasticityProblem.cpp:92
> #19 0xb7df9baf in dolfin::NewtonSolver::solve (this=0xbfb308d4,
> nonlinear_problem=@0xbfb2f814, x=@0x9bb0e48) at dolfin/nls/NewtonSolver.cpp:76
> #20 0x08096370 in main () at main.cpp:184
>
> It's pretty obvious what the error is, but before you say that we should just
> implement evaluate_basis() for QuadratureElement (which is alway 1, if it's
> evaluate exactly at the quadrature point, otherwise it's undefined) I would
> like to know why it is necessary to call evaluate on a function that contains a
> computed result. It should be possible to just pass this function to the Form
> which will handle the interpolation when integrating the form.
>
> Kristian

I don't understand why evaluate_basis is called. The assembler
restricts all coefficients to the local element which results in a
call to evaluate_dof which results in a call to evaluate. Why is
Strain2D.cpp calling evaluate_basis on line 495? It should just return
the value.

--
Anders

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