Dune::LinearOperator< X, Y > Class Template Reference

A linear operator. More...

#include <dune/istl/operators.hh>

Public Types
typedef X	domain_type
	The type of the domain of the operator.
typedef Y	range_type
	The type of the range of the operator.
typedef X::field_type	field_type
	The field type of the operator.

Public Member Functions
virtual void	apply (const X &x, Y &y) const =0
	apply operator to x: $y = A(x)$ The input vector is consistent and the output must also be consistent on the interior+border partition.
virtual void	applyscaleadd (field_type alpha, const X &x, Y &y) const =0
	apply operator to x, scale and add: $y = y + \alpha A(x)$
virtual	~LinearOperator ()
	every abstract base class has a virtual destructor
virtual SolverCategory::Category	category () const =0
	Category of the linear operator (see SolverCategory::Category)

Detailed Description

template<class X, class Y>
class Dune::LinearOperator< X, Y >

A linear operator.

Abstract base class defining a linear operator $A : X\to Y$, i.e. $A(\alpha x) = \alpha A(x)$ and $A(x+y) = A(x)+A(y)$ hold. The simplest solvers just need the application $A(x)$ of the operator.

• enables on the fly computation through operator concept. If explicit representation of the operator is required use AssembledLinearOperator
• Some inverters may need an explicit formation of the operator as a matrix, e.g. BiCGStab, ILU, AMG, etc. In that case use the derived class

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

• dune/istl/operators.hh