TRRQRLRApx< T > Class Template Reference

Uses rank-revealing QR to compute low rank approximation. More...

#include <TLowRankApx.hh>

Inheritance diagram for TRRQRLRApx< T >:

Public Member Functions
virtual TMatrix *	build (const TBlockCluster *bcl, const TTruncAcc &acc) const
virtual TMatrix *	build (const TBlockIndexSet &block_is, const TTruncAcc &acc) const
Public Member Functions inherited from TLowRankApx
virtual bool	has_statistics () const
	indicate if algorithm provides statistics

Detailed Description

template<typename T>
class HLIB::TRRQRLRApx< T >

     TRRQRLRApx uses rank-revealing QR to approximate a given matrix block.
     For the approximation, the complete matrix block has to be evaluated,
     hence complexity is at least O(n²).

Member Function Documentation

build() [1/2]

virtual TMatrix* build ( const TBlockCluster *  bcl, const TTruncAcc &  acc  ) const

virtual

build low rank matrix for block cluster bcl with rank defined by accuracy acc

Reimplemented from TLowRankApx.

build() [2/2]

virtual TMatrix* build ( const TBlockIndexSet &  block_is, const TTruncAcc &  acc  ) const

virtual

build low rank matrix for block index set block_is with rank defined by accuracy acc

Implements TLowRankApx.