From: Michael Orlitzky <michael@orlitzky.com>
Date: Mon, 8 Aug 2016 00:21:58 +0000 (-0400)
Subject: Add LL_cone() convenience function.
X-Git-Url: https://gitweb.michael.orlitzky.com/?a=commitdiff_plain;h=6251a6e0461374bf915ec3695f62cb0349f379ae;hp=ef21e03efdad7f813b15fbcf2f53fccae3c81083;p=sage.d.git

Add LL_cone() convenience function.
---

diff --git a/mjo/cone/cone.py b/mjo/cone/cone.py
index 3b3a028..0bfc3b6 100644
--- a/mjo/cone/cone.py
+++ b/mjo/cone/cone.py
@@ -684,6 +684,11 @@ def Z_operator_gens(K):
     return [ -M(v.list()) for v in Sigma_cone ]
 
 
+def LL_cone(K):
+    gens = K.lyapunov_like_basis()
+    L = ToricLattice(K.lattice_dim()**2)
+    return Cone([ g.list() for g in gens ], lattice=L, check=False)
+
 def Z_cone(K):
     gens = Z_operator_gens(K)
     L = ToricLattice(K.lattice_dim()**2)