MFEM  v4.5.1 Finite element discretization library
mfem::BiLinear2DFiniteElement Class Reference

A 2D bi-linear element on a square with nodes at the vertices of the square. More...

#include <fe_fixed_order.hpp>

Inheritance diagram for mfem::BiLinear2DFiniteElement:
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Collaboration diagram for mfem::BiLinear2DFiniteElement:
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## Public Member Functions

BiLinear2DFiniteElement ()
Construct the BiLinear2DFiniteElement. More...

virtual void CalcShape (const IntegrationPoint &ip, Vector &shape) const

virtual void CalcDShape (const IntegrationPoint &ip, DenseMatrix &dshape) const

virtual void CalcHessian (const IntegrationPoint &ip, DenseMatrix &h) const
Evaluate the Hessians of all shape functions of a scalar finite element in reference space at the given point ip. More...

virtual void ProjectDelta (int vertex, Vector &dofs) const
Project a delta function centered on the given vertex in the local finite dimensional space represented by the dofs. More...

Public Member Functions inherited from mfem::NodalFiniteElement
NodalFiniteElement (int D, Geometry::Type G, int Do, int O, int F=FunctionSpace::Pk)
Construct NodalFiniteElement with given. More...

virtual void GetLocalInterpolation (ElementTransformation &Trans, DenseMatrix &I) const
Return the local interpolation matrix I (Dof x Dof) where the fine element is the image of the base geometry under the given transformation. More...

virtual void GetLocalRestriction (ElementTransformation &Trans, DenseMatrix &R) const
Return a local restriction matrix R (Dof x Dof) mapping fine dofs to coarse dofs. More...

virtual void GetTransferMatrix (const FiniteElement &fe, ElementTransformation &Trans, DenseMatrix &I) const
Return interpolation matrix, I, which maps dofs from a coarse element, fe, to the fine dofs on this finite element. More...

virtual void Project (Coefficient &coeff, ElementTransformation &Trans, Vector &dofs) const
Given a coefficient and a transformation, compute its projection (approximation) in the local finite dimensional space in terms of the degrees of freedom. More...

virtual void Project (VectorCoefficient &vc, ElementTransformation &Trans, Vector &dofs) const
Given a vector coefficient and a transformation, compute its projection (approximation) in the local finite dimensional space in terms of the degrees of freedom. (VectorFiniteElements) More...

virtual void ProjectMatrixCoefficient (MatrixCoefficient &mc, ElementTransformation &T, Vector &dofs) const
Given a matrix coefficient and a transformation, compute an approximation ("projection") in the local finite dimensional space in terms of the degrees of freedom. For VectorFiniteElements, the rows of the coefficient are projected in the vector space. More...

virtual void Project (const FiniteElement &fe, ElementTransformation &Trans, DenseMatrix &I) const
Compute the embedding/projection matrix from the given FiniteElement onto 'this' FiniteElement. The ElementTransformation is included to support cases when the projection depends on it. More...

Compute the discrete gradient matrix from the given FiniteElement onto 'this' FiniteElement. The ElementTransformation is included to support cases when the matrix depends on it. More...

virtual void ProjectDiv (const FiniteElement &fe, ElementTransformation &Trans, DenseMatrix &div) const
Compute the discrete divergence matrix from the given FiniteElement onto 'this' FiniteElement. The ElementTransformation is included to support cases when the matrix depends on it. More...

const Array< int > & GetLexicographicOrdering () const
Get an Array<int> that maps lexicographically ordered indices to the indices of the respective nodes/dofs/basis functions. More...

Public Member Functions inherited from mfem::ScalarFiniteElement
ScalarFiniteElement (int D, Geometry::Type G, int Do, int O, int F=FunctionSpace::Pk)
Construct ScalarFiniteElement with given. More...

c_shape (dof)

virtual void SetMapType (int M)
Set the FiniteElement::MapType of the element to either VALUE or INTEGRAL. Also sets the FiniteElement::DerivType to GRAD if the FiniteElement::MapType is VALUE. More...

void NodalLocalInterpolation (ElementTransformation &Trans, DenseMatrix &I, const ScalarFiniteElement &fine_fe) const
Get the matrix I that defines nodal interpolation between this element and the refined element fine_fe. More...

void ScalarLocalInterpolation (ElementTransformation &Trans, DenseMatrix &I, const ScalarFiniteElement &fine_fe) const
Get matrix I "Interpolation" defined through local L2-projection in the space defined by the fine_fe. More...

void ScalarLocalRestriction (ElementTransformation &Trans, DenseMatrix &R, const ScalarFiniteElement &coarse_fe) const
Get restriction matrix R defined through local L2-projection in the space defined by the coarse_fe. More...

Return a DofToQuad structure corresponding to the given IntegrationRule using the given DofToQuad::Mode. More...

Public Member Functions inherited from mfem::FiniteElement
FiniteElement (int D, Geometry::Type G, int Do, int O, int F=FunctionSpace::Pk)
Construct FiniteElement with given. More...

int GetDim () const
Returns the reference space dimension for the finite element. More...

int GetVDim () const
Returns the vector dimension for vector-valued finite elements. More...

int GetCurlDim () const
Returns the dimension of the curl for vector-valued finite elements. More...

Geometry::Type GetGeomType () const
Returns the Geometry::Type of the reference element. More...

int GetDof () const
Returns the number of degrees of freedom in the finite element. More...

int GetOrder () const
Returns the order of the finite element. In the case of anisotropic orders, returns the maximum order. More...

bool HasAnisotropicOrders () const
Returns true if the FiniteElement basis may be using different orders/degrees in different spatial directions. More...

const int * GetAnisotropicOrders () const
Returns an array containing the anisotropic orders/degrees. More...

int Space () const
Returns the type of FunctionSpace on the element. More...

int GetRangeType () const
Returns the FiniteElement::RangeType of the element, one of {SCALAR, VECTOR}. More...

int GetDerivRangeType () const
Returns the FiniteElement::RangeType of the element derivative, either SCALAR or VECTOR. More...

int GetMapType () const
Returns the FiniteElement::MapType of the element describing how reference functions are mapped to physical space, one of {VALUE, INTEGRAL H_DIV, H_CURL}. More...

int GetDerivType () const
Returns the FiniteElement::DerivType of the element describing the spatial derivative method implemented, one of {NONE, GRAD, DIV, CURL}. More...

int GetDerivMapType () const
Returns the FiniteElement::DerivType of the element describing how reference function derivatives are mapped to physical space, one of {VALUE, INTEGRAL, H_DIV, H_CURL}. More...

void CalcPhysShape (ElementTransformation &Trans, Vector &shape) const
Evaluate the values of all shape functions of a scalar finite element in physical space at the point described by Trans. More...

void CalcPhysDShape (ElementTransformation &Trans, DenseMatrix &dshape) const
Evaluate the gradients of all shape functions of a scalar finite element in physical space at the point described by Trans. More...

const IntegrationRuleGetNodes () const
Get a const reference to the nodes of the element. More...

virtual void CalcVShape (const IntegrationPoint &ip, DenseMatrix &shape) const
Evaluate the values of all shape functions of a vector finite element in reference space at the given point ip. More...

virtual void CalcVShape (ElementTransformation &Trans, DenseMatrix &shape) const
Evaluate the values of all shape functions of a vector finite element in physical space at the point described by Trans. More...

void CalcPhysVShape (ElementTransformation &Trans, DenseMatrix &shape) const
Equivalent to the CalcVShape() method with the same arguments. More...

virtual void CalcDivShape (const IntegrationPoint &ip, Vector &divshape) const
Evaluate the divergence of all shape functions of a vector finite element in reference space at the given point ip. More...

void CalcPhysDivShape (ElementTransformation &Trans, Vector &divshape) const
Evaluate the divergence of all shape functions of a vector finite element in physical space at the point described by Trans. More...

virtual void CalcCurlShape (const IntegrationPoint &ip, DenseMatrix &curl_shape) const
Evaluate the curl of all shape functions of a vector finite element in reference space at the given point ip. More...

virtual void CalcPhysCurlShape (ElementTransformation &Trans, DenseMatrix &curl_shape) const
Evaluate the curl of all shape functions of a vector finite element in physical space at the point described by Trans. More...

virtual void GetFaceDofs (int face, int **dofs, int *ndofs) const
Get the dofs associated with the given face. *dofs is set to an internal array of the local dofc on the face, while *ndofs is set to the number of dofs on that face. More...

virtual void CalcPhysHessian (ElementTransformation &Trans, DenseMatrix &Hessian) const
Evaluate the Hessian of all shape functions of a scalar finite element in reference space at the given point ip. More...

virtual void CalcPhysLaplacian (ElementTransformation &Trans, Vector &Laplacian) const
Evaluate the Laplacian of all shape functions of a scalar finite element in reference space at the given point ip. More...

virtual void CalcPhysLinLaplacian (ElementTransformation &Trans, Vector &Laplacian) const

virtual void ProjectFromNodes (Vector &vc, ElementTransformation &Trans, Vector &dofs) const
Given a vector of values at the finite element nodes and a transformation, compute its projection (approximation) in the local finite dimensional space in terms of the degrees of freedom. Valid for VectorFiniteElements. More...

virtual void ProjectCurl (const FiniteElement &fe, ElementTransformation &Trans, DenseMatrix &curl) const
Compute the discrete curl matrix from the given FiniteElement onto 'this' FiniteElement. The ElementTransformation is included to support cases when the matrix depends on it. More...

virtual ~FiniteElement ()
Deconstruct the FiniteElement. More...

Public Types inherited from mfem::FiniteElement
enum  RangeType { SCALAR, VECTOR }
Enumeration for range_type and deriv_range_type. More...

enum  MapType { VALUE, INTEGRAL, H_DIV, H_CURL }
Enumeration for MapType: defines how reference functions are mapped to physical space. More...

enum  DerivType { NONE, GRAD, DIV, CURL }
Enumeration for DerivType: defines which derivative method is implemented. More...

Static Public Member Functions inherited from mfem::FiniteElement
static bool IsClosedType (int b_type)
Return true if the BasisType of b_type is closed (has Quadrature1D points on the boundary). More...

static bool IsOpenType (int b_type)
Return true if the BasisType of b_type is open (doesn't have Quadrature1D points on the boundary). More...

static int VerifyClosed (int b_type)
Ensure that the BasisType of b_type is closed (has Quadrature1D points on the boundary). More...

static int VerifyOpen (int b_type)
Ensure that the BasisType of b_type is open (doesn't have Quadrature1D points on the boundary). More...

static int VerifyNodal (int b_type)
Ensure that the BasisType of b_type nodal (satisfies the interpolation property). More...

Public Attributes inherited from mfem::ScalarFiniteElement

G

Do

O

F

Protected Member Functions inherited from mfem::NodalFiniteElement
void ProjectCurl_2D (const FiniteElement &fe, ElementTransformation &Trans, DenseMatrix &curl) const

Protected Member Functions inherited from mfem::ScalarFiniteElement

Static Protected Member Functions inherited from mfem::ScalarFiniteElement
static const ScalarFiniteElementCheckScalarFE (const FiniteElement &fe)

Protected Attributes inherited from mfem::NodalFiniteElement
Array< int > lex_ordering

Protected Attributes inherited from mfem::ScalarFiniteElement
Vector c_shape

Protected Attributes inherited from mfem::FiniteElement
int dim
Dimension of reference space. More...

int vdim
Vector dimension of vector-valued basis functions. More...

int cdim
Dimension of curl for vector-valued basis functions. More...

Geometry::Type geom_type
Geometry::Type of the reference element. More...

int func_space

int range_type

int map_type

int deriv_type

int deriv_range_type

int deriv_map_type

int dof
Number of degrees of freedom. More...

int order
Order/degree of the shape functions. More...

int orders [Geometry::MaxDim]
Anisotropic orders. More...

IntegrationRule Nodes

DenseMatrix vshape

Container for all DofToQuad objects created by the FiniteElement. More...

## Detailed Description

A 2D bi-linear element on a square with nodes at the vertices of the square.

Definition at line 78 of file fe_fixed_order.hpp.

## Constructor & Destructor Documentation

 mfem::BiLinear2DFiniteElement::BiLinear2DFiniteElement ( )

Construct the BiLinear2DFiniteElement.

Definition at line 91 of file fe_fixed_order.cpp.

## Member Function Documentation

 void mfem::BiLinear2DFiniteElement::CalcDShape ( const IntegrationPoint & ip, DenseMatrix & dshape ) const
virtual

virtual function which evaluates the values of all partial derivatives of all shape functions at a given point ip and stores them in the matrix dshape (Dof x Dim) (4 x 2) so that each row contains the derivatives of one shape function

Implements mfem::FiniteElement.

Definition at line 113 of file fe_fixed_order.cpp.

 void mfem::BiLinear2DFiniteElement::CalcHessian ( const IntegrationPoint & ip, DenseMatrix & Hessian ) const
virtual

Evaluate the Hessians of all shape functions of a scalar finite element in reference space at the given point ip.

Each row of the result DenseMatrix Hessian contains upper triangular part of the Hessian of one shape function. The order in 2D is {u_xx, u_xy, u_yy}. The size (dof x (dim (dim+1)/2) of Hessian must be set in advance.

Reimplemented from mfem::FiniteElement.

Definition at line 122 of file fe_fixed_order.cpp.

 void mfem::BiLinear2DFiniteElement::CalcShape ( const IntegrationPoint & ip, Vector & shape ) const
virtual

virtual function which evaluates the values of all shape functions at a given point ip and stores them in the vector shape of dimension Dof (4)

Implements mfem::FiniteElement.

Definition at line 104 of file fe_fixed_order.cpp.

 virtual void mfem::BiLinear2DFiniteElement::ProjectDelta ( int vertex, Vector & dofs ) const
inlinevirtual

Project a delta function centered on the given vertex in the local finite dimensional space represented by the dofs.

Reimplemented from mfem::FiniteElement.

Definition at line 97 of file fe_fixed_order.hpp.

The documentation for this class was generated from the following files: