4.22.3.21 isOrigin

Syntax:

isOrigin( cone c )

Type:

int

Purpose:

1 iff the cone is just the origin of the ambient space; 0 otherwise

Example:

LIB"gfanlib.so"; cone c1; // full cone in zero-dimensional ambient space isOrigin(c1); ==> 1 intmat M2[2][2]= 1,0, 0,1; cone c2=coneViaPoints(M2); isOrigin(c2); ==> 0 intmat M3[4][2]= 1,0, 0,1, -1,0, 0,-1; cone c3=coneViaPoints(M3); isOrigin(c3); ==> 0