Reference documentation for deal.II version Git 7f58f27 2017-09-20 15:35:49 -0600
Public Member Functions | Public Attributes | List of all members

#include <deal.II/fe/fe_values_extractors.h>

Public Member Functions

 Vector ()
 Vector (const unsigned int first_vector_component)

Public Attributes

unsigned int first_vector_component

Detailed Description

Extractor for a vector of spacedim components of a vector- valued element. The value of spacedim is defined by the FEValues object the extractor is applied to. The result of applying an object of this type to an FEValues, FEFaceValues or FESubfaceValues object is of type FEValuesViews::Vector.

The concept of extractors is defined in the documentation of the namespace FEValuesExtractors and in the Handling vector valued problems module.

Note that in the current context, a vector is meant in the sense physics uses it: it has spacedim components that behave in specific ways under coordinate system transformations. Examples include velocity or displacement fields. This is opposed to how mathematics uses the word "vector" (and how we use this word in other contexts in the library, for example in the Vector class), where it really stands for a collection of numbers. An example of this latter use of the word could be the set of concentrations of chemical species in a flame; however, these are really just a collection of scalar variables, since they do not change if the coordinate system is rotated, unlike the components of a velocity vector, and consequently, this class should not be used for this context.

Definition at line 103 of file fe_values_extractors.h.

Constructor & Destructor Documentation

Vector< Number >::Vector ( )

Default constructor. Initialize the object with an invalid component. This leads to an object that can not be used, but it allows objects of this kind to be put into arrays that require a default constructor upon resizing the array, and then later assigning a suitable object to each element of the array.

Definition at line 235 of file fe_values_extractors.h.

Vector< Number >::Vector ( const unsigned int  first_vector_component)

Constructor. Take the first component of the selected vector inside the FEValues object as argument.

Definition at line 242 of file fe_values_extractors.h.

Member Data Documentation

unsigned int FEValuesExtractors::Vector::first_vector_component

The first component of the vector view.

Definition at line 108 of file fe_values_extractors.h.

The documentation for this struct was generated from the following file: