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4.24.2 polytopeViaInequalities
Syntax:
polytopeViaInequalities( intmat IE )
polytopeViaInequalities( intmat IE, intmat E )
polytopeViaInequalities( intmat IE, intmat E, int flags )
Type:
- cone
Purpose:
- cone consisting of all points x, such that IE*x >= 0 in each component
and (if stated) E*x = 0;
flags may range between 0,..,3 defining an upper and lower bit
(0=0*2+0, 1=0*2+1, 2=1*2+0, 3=1*2+1),
if higher bit is 1, then program assumes each inequality yields a facet,
if lower bit is 1, then program assumes the kernel of E is the span of the cone,
if either bit is 0, then program computes the information itself.
Example:
| | LIB"gfanlib.so";
intmat IE[2][3]=
1,0,0,
0,1,0;
intmat E[1][3]=
0,0,1;
polytope p=polytopeViaInequalities(IE,E);
p;
==> AMBIENT_DIM
==> 2
==> INEQUALITIES
==> 0,1,0,
==> 1,0,0
==> EQUATIONS
==> 0,0,1
==>
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