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D.13.3.30 gitCone
Procedure from librarygitfan.lib (see gitfan_lib).
- Usage:
- gitCone(a, Q, w); a: ideal, Q:bigintmat, w:bigintmat
- Purpose:
- Returns the GIT-cone lambda(w), i.e. the intersection of all
orbit cones containing the vector w.
- Note:
- call this only if you are interested in a single GIT-cone.
- Return:
- a cone.
LIB "gitfan.lib"; intmat Q[3][4] = 1,0,1,0, 0,1,0,1, 0,0,1,1; ring R = 0,T(1..4),dp; ideal a = 0; bigintmat w[1][3] = 3,3,1; cone lambda = gitCone(a, Q, w); rays(lambda); ==> 1,0,0, ==> 0,1,0, ==> 1,1,1 bigintmat w2[1][3] = 1,1,1; cone lambda2 = gitCone(a, Q, w2); rays(lambda2); ==> 1,1,1 |