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D.13.1.12 containsPositiveVector

Procedure from library gfan.lib (see gfan_lib).

Usage:
containsPositiveVector(c); c cone

Return:
1, if c contains a vector with only positive entries in its relative interior

Example:
 
LIB "gfan.lib";
intmat M1[2][2]=
1,1,
1,-1;
cone c1=coneViaPoints(M1);
containsPositiveVector(c1);
==> 1
intmat M2[2][2]=
0,1,
-1,0;
cone c2=coneViaPoints(M2);
containsPositiveVector(c2);
==> 0