From d6a8bcd750fa41f5f7f0fa47c6fb1053495ab081 Mon Sep 17 00:00:00 2001
From: antelmor <andres.tellez.m13@gmail.com>
Date: Tue, 30 Jan 2024 12:55:38 -0500
Subject: [PATCH] Added definition of identity matrix

---
 TB2J/io_merge.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/TB2J/io_merge.py b/TB2J/io_merge.py
index f5e5e9b..6de6256 100644
--- a/TB2J/io_merge.py
+++ b/TB2J/io_merge.py
@@ -4,6 +4,7 @@
 from itertools import product
 from TB2J.io_exchange import SpinIO
 
+I = np.eye(3)
 uz = np.array([[0.0, 0.0, 1.0]])
 
 def get_rotation_matrix(magmoms):