Reference documentation for deal.II version Git eab6000ff4 20200530 14:50:38 0400

#include <deal.II/numerics/data_postprocessor.h>
Public Attributes  
std::vector<::Vector< double > >  solution_values 
std::vector< std::vector< Tensor< 1, spacedim > > >  solution_gradients 
std::vector< std::vector< Tensor< 2, spacedim > > >  solution_hessians 
Public Attributes inherited from DataPostprocessorInputs::CommonInputs< spacedim >  
std::vector< Tensor< 1, spacedim > >  normals 
std::vector< Point< spacedim > >  evaluation_points 
Additional Inherited Members  
Public Member Functions inherited from DataPostprocessorInputs::CommonInputs< spacedim >  
template<typename DoFHandlerType >  
void  set_cell (const typename DoFHandlerType::cell_iterator &cell) 
template<typename DoFHandlerType >  
DoFHandlerType::cell_iterator  get_cell () const 
A structure that is used to pass information to DataPostprocessor::evaluate_vector_field(). It contains the values and (if requested) derivatives of a vectorvalued solution variable at the evaluation points on a cell or face.
This class is also used if the solution vector is complexvalued (whether it is scalar or vectorvalued is immaterial in that case) since in that case, the DataOut and related classes take apart the real and imaginary parts of a solution vector. In practice, that means that if a solution vector has \(N\) vector components (i.e., there are \(N\) functions that form the solution of the PDE you are dealing with; \(N\) is not the size of the solution vector), then if the solution is realvalued the solution_values
variable below will be an array with as many entries as there are evaluation points on a cell, and each entry is a vector of length \(N\) representing the \(N\) solution functions evaluated at a point. On the other hand, if the solution is complexvalued (i.e., the vector passed to DataOut::build_patches() has complexvalued entries), then the solution_values
member variable of this class will have \(2N\) entries for each evaluation point. The first \(N\) of these entries represent the real parts of the solution, and the second \(N\) entries correspond to the imaginary parts of the solution evaluated at the evaluation point. The same layout is used for the solution_gradients
and solution_hessians
fields: First the gradients/Hessians of the real components, then all the gradients/Hessians of the imaginary components. There is more information about the subject in the documentation of the DataPostprocessor class itself. step58 provides an example of how this class is used in a complexvalued situation.
Through the fields in the CommonInputs base class, this class also makes available access to the locations of evaluations points, normal vectors (if appropriate), and which cell data is currently being evaluated on (also if appropriate).
Definition at line 318 of file data_postprocessor.h.
std::vector<::Vector<double> > DataPostprocessorInputs::Vector< spacedim >::solution_values 
An array of values of a vectorvalued solution at each of the evaluation points used to create graphical output from one cell, face, or other object.
The outer vector runs over the evaluation points, whereas the inner vector runs over the components of the finite element field for which output will be generated.
Definition at line 329 of file data_postprocessor.h.
std::vector<std::vector<Tensor<1, spacedim> > > DataPostprocessorInputs::Vector< spacedim >::solution_gradients 
An array of gradients of a vectorvalued solution at each of the evaluation points used to create graphical output from one cell, face, or other object.
The outer vector runs over the evaluation points, whereas the inner vector runs over the components of the finite element field for which output will be generated.
This array is only filled if a userderived class overloads the DataPostprocessor::get_needed_update_flags(), and the function returns (possibly among other flags) UpdateFlags::update_gradients. Alternatively, a class derived from DataPostprocessorScalar, DataPostprocessorVector, or DataPostprocessorTensor may pass this flag to the constructor of these three classes.
Definition at line 348 of file data_postprocessor.h.
std::vector<std::vector<Tensor<2, spacedim> > > DataPostprocessorInputs::Vector< spacedim >::solution_hessians 
An array of second derivatives of a vectorvalued solution at each of the evaluation points used to create graphical output from one cell, face, or other object.
The outer vector runs over the evaluation points, whereas the inner vector runs over the components of the finite element field for which output will be generated.
This array is only filled if a userderived class overloads the DataPostprocessor::get_needed_update_flags(), and the function returns (possibly among other flags) UpdateFlags::update_hessians. Alternatively, a class derived from DataPostprocessorScalar, DataPostprocessorVector, or DataPostprocessorTensor may pass this flag to the constructor of these three classes.
Definition at line 367 of file data_postprocessor.h.