From 232b6f346bbfdd52b573cc8c5cb7b8ebda686707 Mon Sep 17 00:00:00 2001
From: Christoph Groth <christoph.groth@cea.fr>
Date: Thu, 6 Mar 2014 15:29:05 +0100
Subject: [PATCH] bugfix: do not fail when the Hamiltonian has no non-zero
entries
---
kwant/solvers/common.py | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kwant/solvers/common.py b/kwant/solvers/common.py
index a6bdecda..adeb9f2d 100644
--- a/kwant/solvers/common.py
+++ b/kwant/solvers/common.py
@@ -148,7 +148,7 @@ class SparseSolver(object):
lhs = lhs - energy * sp.identity(lhs.shape[0], format=self.lhsformat)
num_orb = lhs.shape[0]
- if check_hermiticity:
+ if check_hermiticity and len(lhs.data):
rtol = 1e-13
atol = 1e-300
tol = rtol * np.max(np.abs(lhs.data)) + atol
--
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