From 772ee2b0418951959a7decb433b484e8790b5651 Mon Sep 17 00:00:00 2001
From: Arturo Mena <artmenlope@gmail.com>
Date: Thu, 24 Sep 2020 11:13:37 +0200
Subject: [PATCH] Update README.md

---
 README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.md b/README.md
index cee996b..d5e1c48 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,8 @@ In this first set of examples the test function is the following one:
 We start defining the variables and parameters for these first examples:
 
 ```python
+import numpy as np
+
 N = 100
 lim = 3
 x, y = np.meshgrid(np.linspace(-lim,lim,N),