From e0927c6423fd4819d70dfe389cc18c679110783c Mon Sep 17 00:00:00 2001
From: craig-warren <craig_warren@me.com>
Date: Thu, 8 Dec 2016 08:32:34 +0000
Subject: [PATCH] Fixed dispersion analysis for 2D simulations with non-cubic
 cells.

---
 gprMax/grid.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/gprMax/grid.py b/gprMax/grid.py
index 550e0581..b35e8d88 100644
--- a/gprMax/grid.py
+++ b/gprMax/grid.py
@@ -224,7 +224,15 @@ def dispersion_analysis(G):
         minwavelength = minvelocity / results['maxfreq']
 
         # Maximum spatial step
-        delta = max(G.dx, G.dy, G.dz)
+        if G.dimension == '3D':
+            delta = max(G.dx, G.dy, G.dz)
+        elif G.dimension == '2D':
+            if G.nx == 1:
+                delta = max(G.dy, G.dz)
+            elif G.ny == 1:
+                delta = max(G.dx, G.dz)
+            elif G.nz == 1:
+                delta = max(G.dx, G.dy)
 
         # Courant stability factor
         S = (c * G.dt) / delta