From f5d41858013b2f6362748f829562ca3fcde71f1e Mon Sep 17 00:00:00 2001
From: Craig Warren <craig_warren@me.com>
Date: Wed, 6 Jan 2016 18:49:39 +0000
Subject: [PATCH] Corrected bug with transmission line initialisation.

---
 gprMax/sources.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gprMax/sources.py b/gprMax/sources.py
index d6fa06f6..0a1316f7 100644
--- a/gprMax/sources.py
+++ b/gprMax/sources.py
@@ -159,10 +159,11 @@ class MagneticDipole:
 class TransmissionLine:
     """The transmission line source is a one-dimensional transmission line which is attached virtually to a grid cell."""
     
-    def __init__(self, G):
+    def __init__(self, G, length=None):
         """
         Args:
             G (class): Grid class instance - holds essential parameters describing the model.
+            length (float): Length of the transmission line.
         """
         
         self.polarisation = None
@@ -171,7 +172,7 @@ class TransmissionLine:
         self.positionz = None
         self.start = None
         self.stop = None
-        self.length = None
+        self.length = length
         self.resistance = None
         self.waveformID = None