| #### D.13.2.27 isOrigin Procedure from library `gfan.lib` (see gfan_lib). Usage: isOrigin(c); c cone Return: 1, if c is the origin; 0 otherwise Example:
    LIB "gfan.lib";
    cone c1;
    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

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