Description

Class that represent nxn sparse blocks to put into K global matrix, that is blocks that connect N 'variables' and build a matrix K in a sparse variational inequality VI(Z*x-d,K):

See ChSystemDescriptor for more information about the overall problem and data representation.

Note that K blocks often have a physical interpretation as stiffness, but not always, for example they can represent hessians. Note that all blocks in K, all masses and constraint jacobians Cq are not really assembled in large matrices, so to exploit sparsity.

#include <ChKblockGeneric.h>

Inheritance diagram for chrono::ChKblockGeneric:

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Collaboration diagram for chrono::ChKblockGeneric:

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Public Member Functions
	ChKblockGeneric (std::vector< ChVariables * > mvariables)

	ChKblockGeneric (ChVariables mvariableA, ChVariables mvariableB)

ChKblockGeneric &	operator= (const ChKblockGeneric &other)
	Assignment operator: copy from other object.

void	SetVariables (std::vector< ChVariables * > mvariables)
	Set references to the constrained objects, each of ChVariables type, automatically creating/resizing K matrix if needed.

virtual size_t	GetNvars () const override
	Returns the number of referenced ChVariables items.

ChVariables *	GetVariableN (unsigned int m_var) const
	Access the m-th vector variable object.

virtual ChMatrixRef	Get_K () override
	Access the K stiffness matrix as a single block, referring only to the referenced ChVariable objects.

virtual void	MultiplyAndAdd (ChVectorRef result, ChVectorConstRef vect) const override
	Computes the product of the corresponding blocks in the system matrix (ie. More...

virtual void	DiagonalAdd (ChVectorRef result) override
	Add the diagonal of the stiffness matrix block(s) as a column vector to 'result'. More...

virtual void	Build_K (ChSparseMatrix &storage, bool add) override
	Writes the K matrix associated to these variables into a global 'storage' matrix, at the offsets of variables. More...

Member Function Documentation

◆ Build_K()

void chrono::ChKblockGeneric::Build_K	(	ChSparseMatrix &	storage,
		bool	add
	)

overridevirtual

Writes the K matrix associated to these variables into a global 'storage' matrix, at the offsets of variables.

Most solvers do not need this: the sparse 'storage' matrix is used for testing, for direct solvers, for dumping full matrix to Matlab for checks, etc.

Implements chrono::ChKblock.

◆ DiagonalAdd()

void chrono::ChKblockGeneric::DiagonalAdd ( ChVectorRef result )

overridevirtual

Add the diagonal of the stiffness matrix block(s) as a column vector to 'result'.

NOTE: the 'result' vector must already have the size of system unknowns, ie the size of the total variables & constraints in the system; the procedure will use the ChVariable offsets (that must be already updated).

Implements chrono::ChKblock.

◆ MultiplyAndAdd()

void chrono::ChKblockGeneric::MultiplyAndAdd	(	ChVectorRef	result,
		ChVectorConstRef	vect
	)		const

overridevirtual

Computes the product of the corresponding blocks in the system matrix (ie.

the K matrix blocks) by 'vect', and add to 'result'. NOTE: the 'vect' and 'result' vectors must already have the size of the total variables & constraints in the system; the procedure will use the ChVariable offsets (that must be already updated) to know the indexes in result and vect.

Implements chrono::ChKblock.

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

/builds/uwsbel/chrono/src/chrono/solver/ChKblockGeneric.h
/builds/uwsbel/chrono/src/chrono/solver/ChKblockGeneric.cpp

Description

Public Member Functions

Member Function Documentation

◆ Build_K()

◆ DiagonalAdd()

◆ MultiplyAndAdd()