GenericFunction.h¶

Note

The documentation on this page was automatically extracted from the DOLFIN C++ code and may need to be edited or expanded.

class GenericFunction¶

Parent class(es)

ufc::function

Variable

This is a common base class for functions. Functions can be evaluated at a given point and they can be restricted to a given cell in a finite element mesh. This functionality is implemented by sub-classes that implement the eval() and restrict() functions.

DOLFIN provides two implementations of the GenericFunction interface in the form of the classes Function and Expression.

Sub-classes may optionally implement the update() function that will be called prior to restriction when running in parallel.

GenericFunction()¶: Constructor

std::size_t value_rank() const = 0¶: Return value rank

std::size_t value_dimension(std::size_t i) const = 0¶: Return value dimension for given axis

void eval(Array<double> &values, const Array<double> &x, const ufc::cell &cell) const¶: Evaluate at given point in given cell

void eval(Array<double> &values, const Array<double> &x) const¶: Evaluate at given point

void restrict(double *w, const FiniteElement &element, const Cell &dolfin_cell, const double *coordinate_dofs, const ufc::cell &ufc_cell) const = 0¶: Restrict function to local cell (compute expansion coefficients w)

void compute_vertex_values(std::vector<double> &vertex_values, const Mesh &mesh) const = 0¶: Compute values at all mesh vertices

void update() const¶: Update off-process ghost coefficients

double operator()(double x) const¶: Evaluation at given point (scalar function)

double operator()(double x, double y) const¶: Evaluation at given point (scalar function)

double operator()(double x, double y, double z) const¶: Evaluation at given point (scalar function)

double operator()(const Point &p) const¶: Evaluation at given point (scalar function)

void operator()(Array<double> &values, double x) const¶: Evaluation at given point (vector-valued function)

void operator()(Array<double> &values, double x, double y) const¶: Evaluation at given point (vector-valued function)

void operator()(Array<double> &values, double x, double y, double z) const¶: Evaluation at given point (vector-valued function)

void operator()(Array<double> &values, const Point &p) const¶: Evaluation at given point (vector-valued function)

std::size_t value_size() const¶: Evaluation at given point Return value size (product of value dimensions)

void evaluate(double *values, const double *coordinates, const ufc::cell &cell) const¶: Evaluate function at given point in cell