LatCommon::Base Class Reference

This class represents a basis for a lattice. More...

#include <Base.h>

Inherits BMat.

Public Member Functions
	Base (int d, int maxDim, NormType norm=L2NORM)
	Constructor. More...
	Base (const Base &)
	Copy constructor.
	~Base ()
	Destructor.
Base &	operator= (const Base &)
	Assignment operator.
void	kill ()
	Cleans and releases all memory used by the basis.
void	swap (Base &b)
	Swaps this basis with the basis b.
void	permute (int i, int j)
	Exchanges vectors \(i\) and \(j\) in the basis.
int	getDim () const
	Returns the actual dimension of the basis.
void	setDim (int d)
	Resets the actual dimension of the basis to d, but does not reserve any new memory.
int	getMaxDim () const
	Returns the maximal dimension of the basis.
NormType	getNorm () const
	Returns the norm used by the basis.
void	setNorm (NormType norm)
	Sets the norm used by the basis.
bool	isNegativeNorm (int i) const
	Returns true if the \(i\)-th vector's norm is not updated and erroneous. More...
void	setNegativeNorm (bool flag)
	Sets the dirty flag of the norms to flag.
void	setNegativeNorm (bool flag, int j)
	Sets the negative flag for the \(j\)-th vector to flag.
NScal	getVecNorm (int i) const
	Returns the \(i\)-th vector's norm.
void	setVecNorm (NScal &value, int i)
	Sets the \(i\)-th vector's norm to value. More...
void	updateVecNorm ()
	Recalculates the norm of each vector in the basis.
void	updateVecNorm (int d)
	Same as above, except that the recalculation begins at dimension d + 1.
void	updateScalL2Norm (int d)
	Updates the norm of vector at dimension d using the L2NORM.
void	updateScalL2Norm (int d1, int d2)
	Updates the norm of all basis vectors from dimensions d1 to d2 (inclusive) using the L2NORM.
std::string	toString () const
	Writes the basis in a string and returns it.
std::string	toString (int i) const
	Writes the \(i\)-th basis vector in a string and returns it.
void	write () const
	Writes the basis on standard output.
void	write (int i) const
	Writes \(i\)-th basis vector on standard output.

Protected Attributes
int	m_dim
	Actual dimension of the basis.
int	m_maxDim
	Maximum dimension of the basis.
NormType	m_norm
	Norm used to calculate the norm of the vectors.
NVect	m_vecNorm
	The norm of each vector in the basis.
bool *	m_negFlag
	Indicates whether a vector norm must be recalculated or not.

Detailed Description

This class represents a basis for a lattice.

To compute the length of vectors, one may use either the \(L_1\), the \(L_2\) or the \(L_\infty\) norms. If one uses the \(L_2\) norm and if BScal and NScal are of type double, then the norm could overflow if the components of the basis vectors are larger than \(\approx 2^{500}\). In that case, NScal may be chosen as RR. If one uses the \(L_1\) or the \(L_\infty\) norms, NScal may be chosen the same as BScal.

Constructor & Destructor Documentation

LatCommon::Base::Base	(	int	d,
		int	maxDim,
		NormType	norm = L2NORM
	)

Constructor.

Builds a basis of actual dimension \(d\), maximum dimension maxDim and with norm norm.

Member Function Documentation

bool LatCommon::Base::isNegativeNorm ( int  i ) const

inline

Returns true if the \(i\)-th vector's norm is not updated and erroneous.

Returns false otherwise.

References m_negFlag.

void LatCommon::Base::setVecNorm	(	NScal &	value,
		int	i
	)

Sets the \(i\)-th vector's norm to value.

The negative flag for this vector is set to false and no data integrity is made.

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

• latcommon/include/latcommon/Base.h