From 6adf7afd6213b9a35b7ab10db694987deb946b72 Mon Sep 17 00:00:00 2001
From: Anton Akhmerov <anton.akhmerov@gmail.com>
Date: Tue, 8 Mar 2016 17:50:42 +0100
Subject: [PATCH] extra check for attaching leads
---
kwant/builder.py | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kwant/builder.py b/kwant/builder.py
index c594f720..b43b5547 100644
--- a/kwant/builder.py
+++ b/kwant/builder.py
@@ -1070,6 +1070,9 @@ class Builder(object):
The lead numbering starts from zero and increments from there, i.e.
the leads are numbered in the order in which they are attached.
"""
+ if self.symmetry.num_directions:
+ raise ValueError("Can only attach leads to finite systems")
+
if add_cells < 0 or int(add_cells) != add_cells:
raise ValueError('add_cells must be an integer >= 0.')
--
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