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D.13.2.51 isPure

Procedure from library gfan.lib (see gfan_lib).

Usage:
isPure(f); f fan

Return:
1 if all maximal cones of f are of the same dimension 0 otherwise

Example:
 
LIB "gfan.lib";
fan f=fullFan(2);
isPure(f);
==> 1
fan g=emptyFan(2);
intmat M1[2][2]=
1,0,
0,1;
cone c1=coneViaPoints(M1);
insertCone(g,c1);
isPure(g);
==> 1
intmat M2[1][2]=
0,-1;
cone c2=coneViaPoints(M2);
insertCone(g,c2);
isPure(g,c2);
==> // ** too many arguments for isPureInternal
==> 0

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