From 041d53843041afa95a71bc191ee0743789fe8e20 Mon Sep 17 00:00:00 2001
From: Michael Wimmer <wimmer@lorentz.leidenuniv.nl>
Date: Fri, 30 Aug 2013 12:31:34 +0200
Subject: [PATCH] make error in add_site_family more proper
---
kwant/lattice.py | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kwant/lattice.py b/kwant/lattice.py
index 844815f..78ab556 100644
--- a/kwant/lattice.py
+++ b/kwant/lattice.py
@@ -558,7 +558,7 @@ class TranslationalSymmetry(builder.Symmetry):
det_m = int(round(np.linalg.det(m)))
if det_m == 0:
- raise ValueError('Singular symmetry matrix.')
+ raise RuntimeError('Adding site group failed.')
det_x_inv_m = \
np.array(np.round(det_m * np.linalg.inv(m)), dtype=int)
--
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