Detailed Description
A namespace in which we declare "extractors", i.e. classes that when used as subscripts in operator[] expressions on
FEValues,
FEFaceValues, and
FESubfaceValues objects extract certain components of a vector-valued element. There are extractors for single scalar components as well as vector components consisting of
dim
elements.
See the description of the Handling vector valued problems module for examples how to use the features of this namespace.