From 59c9a173b4a7f994a40461ccdffa6beb4ac1c3d3 Mon Sep 17 00:00:00 2001
From: HGangloff <hugo.gangloff@inrae.fr>
Date: Mon, 9 Dec 2024 13:13:07 +0100
Subject: [PATCH] Correct derivatives in Burgers equation (#389)

* Correct derivatives in Burgers equation
---
 docs/source/_rst/tutorials/tutorial12/tutorial.rst | 4 ++--
 tutorials/tutorial12/tutorial.ipynb                | 4 ++--
 tutorials/tutorial12/tutorial.py                   | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/docs/source/_rst/tutorials/tutorial12/tutorial.rst b/docs/source/_rst/tutorials/tutorial12/tutorial.rst
index db11814..0542132 100644
--- a/docs/source/_rst/tutorials/tutorial12/tutorial.rst
+++ b/docs/source/_rst/tutorials/tutorial12/tutorial.rst
@@ -132,8 +132,8 @@ parameter :math:`\nu`:
             self.nu = nu 
         
             def equation(input_, output_):
-                    return grad(output_, input_, d='x') +\
-                           output_*grad(output_, input_, d='t') -\
+                    return grad(output_, input_, d='t') +\
+                           output_*grad(output_, input_, d='x') -\
                            self.nu*laplacian(output_, input_, d='x')
     
                 
diff --git a/tutorials/tutorial12/tutorial.ipynb b/tutorials/tutorial12/tutorial.ipynb
index 8f75284..d374bb1 100644
--- a/tutorials/tutorial12/tutorial.ipynb
+++ b/tutorials/tutorial12/tutorial.ipynb
@@ -161,8 +161,8 @@
     "        self.nu = nu \n",
     "    \n",
     "        def equation(input_, output_):\n",
-    "                return grad(output_, input_, d='x') +\\\n",
-    "                       output_*grad(output_, input_, d='t') -\\\n",
+    "                return grad(output_, input_, d='t') +\\\n",
+    "                       output_*grad(output_, input_, d='x') -\\\n",
     "                       self.nu*laplacian(output_, input_, d='x')\n",
     "\n",
     "            \n",
diff --git a/tutorials/tutorial12/tutorial.py b/tutorials/tutorial12/tutorial.py
index 63ae71f..515841a 100644
--- a/tutorials/tutorial12/tutorial.py
+++ b/tutorials/tutorial12/tutorial.py
@@ -113,7 +113,7 @@ class Burgers1DEquation(Equation):
         self.nu = nu 
     
         def equation(input_, output_):
-                return grad(output_, input_, d='x') +                       output_*grad(output_, input_, d='t') -                       self.nu*laplacian(output_, input_, d='x')
+                return grad(output_, input_, d='t') +                       output_*grad(output_, input_, d='x') -                       self.nu*laplacian(output_, input_, d='x')
 
             
         super().__init__(equation)