Dear Joaquin,

The warning appears because you are calling a function 
<https://dealii.org/8.4.1/doxygen/deal.II/classTensor.html#a24139ea4e2f83c058206632e21efcc9f>
 
that is marked as deprecated, so although it remains in the library for now 
it will be removed in the near future.

There are two alternate functions you can call if you would like to remove 
the warning right now. They are the normal "* operator" 
<https://dealii.org/8.4.1/doxygen/deal.II/classTensor.html#acff14b5a87224a20eb287ed06017c80f>
 (if 
contracting over the inner two indices of the tensors) and the general 
contract 
<https://dealii.org/8.4.1/doxygen/deal.II/classTensor.html#a0923600f30b498c743cbef3d2eab4993>
 
function that takes in two tensors and returns the result. The indices over 
which the contract function operates are specified as template parameters. 
You can see an example of how to use it in the function documentation.

I hope that this helps you.
Jean-Paul

On Thursday, December 15, 2016 at 12:06:16 AM UTC+1, Joaquin wrote:
>
> Dear all,
>
> I am trying to run the IFEM code on FSI problems, developed by Luca 
> Heltai. I am using deal.II 8.4.1. I edited some parts of the code due to 
> warnings because it is considered deprecated for the version I am using. I 
> stopped when warning appears for line 1038:
>
> 1037              if((!par.semi_implicit) || (!par.use_spread))
> *1038                  contract (PeFT, Pe[qs], 2, F[qs], 2);    *
>
> The warning I see is as follows:
>
> jomivalen@Nalia ~/ifem/ans-ifem $ make
> Scanning dependencies of target ifem
> [ 25%] Building CXX object CMakeFiles/ifem.dir/source/immersed_fem.cc.o
> /home/jomivalen/ifem/ans-ifem/source/immersed_fem.cc: In instantiation of 
> ‘void 
> ImmersedFEM<dim>::residual_and_or_Jacobian(dealii::BlockVector<double>&, 
> dealii::BlockSparseMatrix<double>&, const dealii::BlockVector<double>&, 
> const dealii::BlockVector<double>&, double, double) [with int dim = 2]’:
> /home/jomivalen/ifem/ans-ifem/source/immersed_fem.cc:2046:16:   required 
> from here
> /home/jomivalen/ifem/ans-ifem/source/immersed_fem.cc:1038:44: warning: 
> ‘void dealii::contract(dealii::Tensor<2, dim, Number>&, const 
> dealii::Tensor<2, dim, Number>&, unsigned int, const dealii::Tensor<2, dim, 
> Number>&, unsigned int) [with int dim = 2; Number = double]’ is deprecated 
> (declared at 
> /home/jomivalen/cfem/dealii/include/deal.II/base/tensor_deprecated.h:262) 
> [-Wdeprecated-declarations]
>          contract (PeFT, Pe[qs], 2, F[qs], 2);   // contract (PeFT, 
> Pe[qs], 2, F[qs], 2);
>                                             ^
>
> I don't know how to actualize the contract function despite having seen 
> the indications in the file "tensor.h".
>
> Thanks for any help,
> Joaquín
>

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