Dear all,
I am trying to use functions from the MeshFunction class in a test file
I have adapted from example 3. In particular, I would like to calculate
the gradient at a given point. I'm having trouble figuring out what
variables are needed for the constructor:
So here are the constructor declarations from mesh_function.h:
/**
* Constructor for mesh based functions with vectors
* as return value. Optionally takes a master function.
* If the MeshFunction is to be evaluated outside of the
* local partition of the mesh, then both the mesh in
* \p eqn_systems and the coefficient vector \p vec
* should be serialized.
*/
MeshFunction (const EquationSystems& eqn_systems,
const NumericVector<Number>& vec,
const DofMap& dof_map,
const std::vector<unsigned int>& vars,
const FunctionBase* master=NULL);
/**
* Constructor for mesh based functions with a number
* as return value. Optionally takes a master function.
* If the MeshFunction is to be evaluated outside of the
* local partition of the mesh, then both the mesh in
* \p eqn_systems and the coefficient vector \p vec
* should be serialized.
*/
MeshFunction (const EquationSystems& eqn_systems,
const NumericVector<Number>& vec,
const DofMap& dof_map,
const unsigned int var,
const FunctionBase* master=NULL);
eqn_systems and dof_map are clear.
It says that vec (internally, _vector) holds the data to be
interpolated. I thought this was part of eqn_system .
I appears to me that var/vars is supposed to be the number of the
attached variables (in this case, just "u"). Since I have only one
field, should this be '0'?
Finally, I'm not completely sure what FunctionBase does (am I okay
leaving it blank).
Sorry for all my n00b questions, and thanks for your help.
-Brent
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