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D.13.2.48 getCone
Procedure from library gfan.lib (see gfan_lib).
- Usage:
- getCone(f,d,i[,m]); f fan, d int, i int, m int
- Assume:
- d is between 0 and ambientDimension(f)
i is between 1 and numberOfConesOfDimension(f,d,o,m)
- Return:
- cone, returns in the fan f of all cones in dimension d the i-th cone
if m!=0, it will enumerate over maximal cones only
Example:
| | LIB "gfan.lib";
intmat M[3][3]=
1,0,0,
0,1,0,
0,0,1;
cone c=coneViaPoints(M);
fan f=emptyFan(3);
insertCone(f,c);
getCone(f,2,1,0);
==> AMBIENT_DIM
==> 3
==> FACETS
==> 0,0,1,
==> 0,1,0
==> LINEAR_SPAN
==> -1,0,0
==>
getCone(f,2,2,0);
==> AMBIENT_DIM
==> 3
==> FACETS
==> 0,0,1,
==> 1,0,0
==> LINEAR_SPAN
==> 0,-1,0
==>
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