Ali,
I'm very new to Deal.ii and trying to understand it through modifying
step-15. However I get the following error. Although it is descriptive I'm
unable to figure out the problem:
"error: no match for ‘operator*’ (operand types are ‘const dealii::Tensor<1,
2>’ and ‘__gnu_cxx::__alloc_traits<std::allocator<dealii::Vector<double> >
>::value_type {aka dealii::Vector<double>}’)
* old_solution_values[q] "
What the error message is telling you is that you are trying to take the
product (with operator *) between a Tensor<1,2> and a Vector<double> object,
but that that is not defined. This is not defined even if the Vector has length 2.
I believe that the error comes out of this statement:
(fe_values.shape_grad(i, q)
* old_solution_values[q]
* fe_values.shape_grad(j, q)))
Here you multiply tensor times vector times tensor. It's not clear to me what
that is supposed to represent, but that's at least where the error is from.
Best
W.
--
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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