From 2c3c1a76cc4e913627cb4e5c4f3d9a41fd7e4345 Mon Sep 17 00:00:00 2001
From: Averyhong <你的邮箱@example.com>
Date: Tue, 5 May 2026 11:20:15 +0800
Subject: [PATCH] FIX: Define missing discount factor to resolve NameError in
 MPE notebook

---
 lectures/markov_perf.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lectures/markov_perf.md b/lectures/markov_perf.md
index 49d870890..7b9279cc7 100644
--- a/lectures/markov_perf.md
+++ b/lectures/markov_perf.md
@@ -446,8 +446,9 @@ In particular, let's take F2 as computed above, plug it into {eq}`eq_mpe_p1p` an
 We hope that the resulting policy will agree with F1 as computed above
 
 ```{code-cell} ipython3
+beta = 0.96
 Λ1 = A - B2 @ F2
-lq1 = qe.LQ(Q1, R1, Λ1, B1, beta=β)
+lq1 = qe.LQ(Q1, R1, Λ1, B1, beta=beta)
 P1_ih, F1_ih, d = lq1.stationary_values()
 F1_ih
 ```