From c796b9a8d2461bc68de8b71955a89d651c075f7f Mon Sep 17 00:00:00 2001
From: Michael Mayer <michael.mayer@desy.de>
Date: Mon, 15 Feb 2016 10:17:28 +0100
Subject: [PATCH] added check for non-zero rotation angle pattern

---
 examples/csbkgmodel.py | 4 ++++
 1 file changed, 4 insertions(+), 0 deletions(-)

diff --git a/examples/csbkgmodel.py b/examples/csbkgmodel.py
index 28a97e3..c8f0acd 100644
--- a/examples/csbkgmodel.py
+++ b/examples/csbkgmodel.py
@@ -465,6 +465,10 @@ class csbkgmodel(ctools.cscript):
                 # Compute number of rotation angles to be considered
                 rotangle_pattern = int(events.size() / self.m_n_angles) 
                 
+                # Rotangle pattern must not be zero
+                if rotangle_pattern == 0:
+                    rotangle_pattern += 1
+                
                 # Loop over bins  
                 for i in range(self.m_xbins):
                     for j in range(self.m_ybins):     
--
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