added a comment after the change

gsuarezr · Nov 14, 2024 · 4862c7f · 4862c7f
1 parent 82747b3
commit 4862c7f
Showing 1 changed file with 3 additions and 1 deletion.
diff --git 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)),