From 69fec94326e56ec009f62c7626422be71fbe3f08 Mon Sep 17 00:00:00 2001
From: Vighnesh Birodkar <vighneshbirodkar@gmail.com>
Date: Wed, 6 Aug 2014 02:46:29 +0530
Subject: [PATCH] rag copy in threshold cut

---
 skimage/graph/graph_cut.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/skimage/graph/graph_cut.py b/skimage/graph/graph_cut.py
index 9c133bd3..bc694409 100644
--- a/skimage/graph/graph_cut.py
+++ b/skimage/graph/graph_cut.py
@@ -47,6 +47,7 @@ def cut_threshold(labels, rag, thresh):
 
     """
     # Because deleting edges while iterating through them produces an error.
+    rag = rag.copy()
     to_remove = [(x, y) for x, y, d in rag.edges_iter(data=True)
                  if d['weight'] >= thresh]
     rag.remove_edges_from(to_remove)