Dear all,

If I don't have the exact solution, but I want to compute the L2 form of 
u_{h}-u_{finest} (i.e. see u_{finest} as the exact solution, and u_{finest} 
is the numerical solution with the finest mesh grid among the series we 
want to test, for example, the width of the unit meshgrid is h = 1/2^k, 
k=6,7,8,9,10. So the u_{finest}=u_{h=1/2^10}). Does deal.ii have a function 
like
template<int dim, class InVector , class OutVector , int spacedim>

void VectorTools::integrate_difference ( const Mapping 
<https://www.dealii.org/developer/doxygen/deal.II/classMapping.html>< dim, 
spacedim > & mapping,
const DoFHandler 
<https://www.dealii.org/developer/doxygen/deal.II/classDoFHandler.html>< dim
, spacedim > & dof,
const InVector & fe_function,
const Function 
<https://www.dealii.org/developer/doxygen/deal.II/classFunction.html>< 
spacedim, double > & exact_solution,
OutVector & difference,
const Quadrature 
<https://www.dealii.org/developer/doxygen/deal.II/classQuadrature.html>< 
dim > & q,
const NormType 
<https://www.dealii.org/developer/doxygen/deal.II/group__numerics.html#ga69967cb7a148a7169963126249213db1>
 
& norm,
const Function 
<https://www.dealii.org/developer/doxygen/deal.II/classFunction.html>< 
spacedim, double > * weight = nullptr,
const double exponent = 2. 
)


and doesn't use 

const Function 
<https://www.dealii.org/developer/doxygen/deal.II/classFunction.html><
 spacedim, double > & exact_solution,
but use

const InVector & fe_function,
at this location of input parameters. Thanks in advance!

Best, 
Chucui

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