Version 5.0 The LEDA User Manual

5.10 Double-Valued Vectors ( vector )
1. Definition
An instance of data type vector is a vector of variables of type double.
#include < LEDA/numbers/vector.h >
2. Creation
vector v; creates an instance v of type vector; v is initialized to the zerodimensional
vector.
vector v(int d); creates an instance v of type vector; v is initialized to the zero
vector of dimension d.
vector
vector
vector
v(double a, double b);
creates an instance v of type vector; v is initialized to the twodimensional
vector (a, b).
v(double a, double b, double c);
creates an instance v of type vector; v is initialized to the threedimensional
vector (a, b, c).
v(const vector& w, int prec);
creates an instance v of type vector; v is initialized to a copy of w.
The second argument is for compatibility with rat vector.
3. Operations
int v.dim( ) returns the dimension of v.
double& v[int i] returns i-th component of v.
Precondition: 0 ≤ i ≤ v.dim()−1.
double v.hcoord(int i) for compatibility with rat vector.
double v.coord(int i) for compatibility with rat vector.
double v.sqr length( ) returns the square of the Euclidean length of v.
double v.length( ) returns the Euclidean length of v.
vector v.norm( ) returns v normalized.
double v.angle(const vector& w) returns the angle between v and w.