From 4862c7f3486b2defc95ab82ee8ae968639af54f5 Mon Sep 17 00:00:00 2001
From: mcditooss <gerardofingurbe@gmail.com>
Date: Fri, 15 Nov 2024 00:23:06 +0100
Subject: [PATCH] added a comment after the change

---
 qutip/core/environment.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/qutip/core/environment.py b/qutip/core/environment.py
index 6e32fb1e67..a27aee2b61 100644
--- a/qutip/core/environment.py
+++ b/qutip/core/environment.py
@@ -1339,7 +1339,9 @@ def _matsubara_params(self, Nk):
         Om = np.sqrt(self.w0**2 - (self.gamma / 2)**2)
         Gamma = self.gamma / 2
 
-        z = float('inf') if self.T == 0 else (Om + 1j * Gamma) / (2*self.T)
+        z = (np.inf * (1 + 1j) if self.T == 0
+             else (Om + 1j * Gamma) / (2*self.T))
+        # we set the argument of the hyperbolic tangent to infinity if T=0
         ck_real = ([
             (self.lam**2 / (4 * Om))
             * (1 / np.tanh(z)),