Computing secondary fans

Postby **ren** » 09 Mar 2020, 11:34

Can somebody please explain to me how to compute the secondary fan of [0,3]x[0,3] (i.e., the moduli space of tropical plane curves of bidegree (3,3))?

The following code only produces an empty fan for me:

Code: Select all

$M33 = new Matrix([[0,0],[1,0],[2,0],[3,0],
                   [0,1],[1,1],[2,1],[3,1],
                   [0,2],[1,2],[2,2],[3,2],
                   [0,3],[1,3],[2,3],[3,3]]);
$VC33 = new VectorConfiguration(VECTORS=>$M33);

application "fan";
$SF33 =	secondary_fan($VC33);

Also any hint on how to specify symmetries on the point configuration is greatly appreciated (I am trying to reproduce the number 5941 in https://arxiv.org/abs/1409.4395).