Hi, all.
I have a question on how 'VectorTools::integrate_difference' works
const MappingQ<dim> mapping (degree);
VectorTools::integrate_difference (mapping,
dof_handler,solution,Solution<dim>(),
difference_per_cell,QGauss<dim>(degree+2),VectorTools::L2_norm);
const double L2_error = difference_per_cell.l2_norm();
I use this function, to compare my numerical solution with exact solution
which is continuous function.
If I have numerical solution,
In cell-wise, I have node values of numerical solution at each dof point.
(Quadrature Point) - I think that dof_handler has all of this information
already.
So, I think I don't need to generate new quadrature points to integrate my
numerical solution.
In a same way, I think I can use same quadrature points to integrate
continuous function.
But the function ask me a input of which guadrature to use to integrate
this .......I don't understand where do we need this quadrature...
what is the role of 6th argument of this function ?
QGauss<dim>(degree+2)
Thank you always !
Jaekwang Kim
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