Public Member Functions | |
| Vector (const unsigned int first_vector_component) | |
Public Attributes | |
| unsigned int | first_vector_component |
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 196 of file fe_values.h.
| FEValuesExtractors::Vector::Vector | ( | const unsigned int | first_vector_component ) |
Constructor. Take the first component of the selected vector inside the FEValues object as argument.
The first component of the vector view.
Definition at line 202 of file fe_values.h.
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