Dynamic vectors.Class DVector is a derived class of Vector adding automatic memory management to such objects. This allows to implement maths operations operator+() and operator-(). Further, it is possible to reset the dimension of a DVector via method reDim(). However, this may render all references to values of a reDim()ed DVector invalid. More...

#include <dvector.h>

Inheritance diagram for DVector:

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Public Member Functions
Access
void	reDim (int newdim)
	resets DVector's dimension to `newdim`.

void	reSize (int newsize)
	resets DVector's memory size to `newsize`.

void	reSize (int newsize, int newdim)
	resets DVector's memory size to `newsize` and dimension to `newdim`.

int	memSize () const
	returns DVector's memory size.

bool	isConsistent () const
	consistency check.

Construction / destruction
	DVector (int dim=0)
	default constructor. `dim` is the initial dimension.

	DVector (const Vector &old)
	copy constructor.

	DVector (const Vector_exact &old)
	cast from exact vector.

	DVector (const DVector &old)
	copy constructor.

DVector &	operator= (const Vector &vec)
	assignment operator.

DVector &	operator= (const DVector &vec)
	assignment operator.

DVector &	operator= (const SVector &vec)
	assingment operator.

	~DVector ()
	destructor.

Public Member Functions inherited from Vector
	Vector (int p_dimen, Real *p_val)
	construction

Vector &	operator= (const Vector &vec)
	Assignment operator.

Vector &	operator= (const SVector &vec)
	Assignment operator.

Vector &	operator= (const SSVector &vec)
	Assignment operator.

Vector &	operator= (const Vector_exact &vec)
	Assignment operator.

Vector &	assign (const SVector &sv)
	Assign values of `sv`.

Vector &	assign (const SSVector &sv)
	Assign values of `sv`.

int	dim () const
	dimension of vector

Real &	operator[] (int n)
	return `n` 'th value by reference

Real	operator[] (int n) const
	return `n` 'th value

Vector &	operator+= (const Vector &vec)
	vector addition

Vector &	operator+= (const SVector &vec)
	vector addition

Vector &	operator+= (const SSVector &vec)
	vector addition

Vector &	operator-= (const Vector &vec)
	vector difference

Vector &	operator-= (const SVector &vec)
	vector difference

Vector &	operator-= (const SSVector &vec)
	vector difference

Vector &	operator*= (Real x)
	scaling

Real	operator* (const SSVector &v) const
	inner product.

Real	operator* (const SVector &v) const
	inner product.

Real	operator* (const Vector &v) const
	inner product.

Real	maxAbs () const
	absolute biggest element (infinity norm).

Real	minAbs () const
	absolute smallest element.

Real	length () const
	euclidian norm.

Real	length2 () const
	squared norm.

Vector &	multAdd (Real x, const SVector &vec)
	addition of scaled vector

Vector &	multAdd (Real x, const SSVector &svec)
	addition of scaled vector

Vector &	multAdd (Real x, const Vector &vec)
	addition of scaled vector

Real *	get_ptr ()
	Conversion to C-style pointer.

const Real *	get_const_ptr () const
	Conversion to C-style pointer.

bool	isConsistent () const
	consistency check.

void	clear ()
	set vector to 0.

Private Attributes
Data
int	memsize
	length of array of values mem

Real *	mem
	value array to be used

Friends
Arithmetic operations (friends)
DVector	operator+ (const Vector &v, const Vector &w)
	adding vectors.

DVector	operator+ (const SVector &v, const Vector &w)
	adding vectors.

DVector	operator+ (const Vector &v, const SVector &w)
	adding vectors.

DVector	operator- (const Vector &v, const Vector &w)
	subtracting vectors.

DVector	operator- (const SVector &v, const Vector &w)
	subtracting vectors.

DVector	operator- (const Vector &v, const SVector &w)
	subtracting vectors.

DVector	operator- (const Vector &vec)
	negation operator.

DVector	operator- (const SVector &vec)
	negation operator.

DVector	operator* (const Vector &v, Real x)
	scaling vectors with a real number.

DVector	operator* (Real x, const Vector &v)
	scaling vectors with a real number.

I/O
std::istream &	operator>> (std::istream &s, DVector &vec)
	output operator.

Friends inherited from Vector

Additional Inherited Members
Protected Attributes inherited from Vector
int	dimen
	dimension of vector

Real *	val
	values of a vector

Detailed Description

Dynamic vectors.

Class DVector is a derived class of Vector adding automatic memory management to such objects. This allows to implement maths operations operator+() and operator-(). Further, it is possible to reset the dimension of a DVector via method reDim(). However, this may render all references to values of a reDim()ed DVector invalid.

For vectors that are often subject to reDim() it may be unconvenient to reallocate the required memory every time. Instead, an array of values of length memSize() is kept, where only the first dim() elements are used. Initially, memSize() == dim(). However, if the dimension is increased, memSize() will be increased at least by a factor of 1.2 to be prepared for future (small) reDim()s. Finally, one can explicitly set memSize() with method reSize(), but not lower than dim().

Definition at line 53 of file dvector.h.