From 8e8e5fa94d42b14daff75eb94e122e56d2503545 Mon Sep 17 00:00:00 2001
From: Sathish Kumar RK <rksathish09@gmail.com>
Date: Thu, 20 Feb 2020 10:57:08 +0000
Subject: [PATCH] fix matplolib import error

---
 src/4_sommerfeld_model_solutions.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/4_sommerfeld_model_solutions.md b/src/4_sommerfeld_model_solutions.md
index b661c05b..3772ce8b 100644
--- a/src/4_sommerfeld_model_solutions.md
+++ b/src/4_sommerfeld_model_solutions.md
@@ -130,6 +130,8 @@ CV = (dEplus - dEmin) / (2*dT);
 1.
 
 ```python
+import numpy as np
+import matplotlib.pyplot as plt
 x = np.linspace(-1, 1, 100)
 fig, ax = plt.subplots(figsize=(7, 5))
 ax.plot(x, x, 'b')
-- 
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