Version 5.0 The LEDA User Manual

at vector
v(const array& A);
introduces a variable v of type rat vector initialized to
the d-dimensional vector with homogeneous coordinates
(±c 0 , . . . , ±c d−1 , ±D), where d = A.size() and A[i] =
c i /D, for i = 0, . . . , d − 1.
rat vector
v(integer a, integer b);
introduces a variable v of type rat vector initialized to
the two-dimensional vector with homogeneous representation
(a, b, 1).
rat vector
v(const integer vector& c, integer D);
introduces a variable v of type rat vector initialized
to the vector with homogeneous coordinates
(±c 0 , . . . , ±c d−1 , ±D), where d is the dimension of c and
the sign chosen is the sign of D.
Precondition: D is non-zero.
rat vector
v(const integer vector& c);
introduces a variable v of type rat vector initialized to
the direction with homogeneous coordinate vector ±c,
where the sign chosen is the sign of the last component
of c.
Precondition: The last component of c is non-zero.
rat vector
v(const vector& w, int prec);
introduces a variable v of type rat vector initialized to
(⌊P ∗ w 0 ⌋, . . . , ⌊P ∗ w d−1 ⌋, P ), where d is the dimension
of w and P = 2 prec .
3. Operations
3.1 Initialization, Access and Conversions
rat vector rat vector :: d2(integer a, integer b, integer D)
returns a rat vector of dimension 2 initialized
to a vector with homogeneous representation
(a, b, D) if D is positive and representation
(−a, −b, −D) if D is negative.
Precondition: D is non-zero.