| #### D.13.2.16 dimension Procedure from library `gfan.lib` (see gfan_lib). Usage: dimension(c); c cone dimension(f); f fan dimension(p); p polytope Return: int, the dimension of the input Example:
    LIB "gfan.lib";
    intmat M1[1][2]=
    1,0;
    cone c1=coneViaPoints(M1);
    dimension(c1);
    ==> 1
    intmat M2[2][2]=
    1,0,
    0,1;
    cone c2=coneViaPoints(M2);
    dimension(c2);
    ==> 2
    fan f = emptyFan(2);
    dimension(f);
    ==> -1
    insertCone(f,c1);
    dimension(f);
    ==> 1
    insertCone(f,c2);
    dimension(f);
    ==> 2

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