From 1edba77ecf5bfd473b1a5c2203e0dd7340cdf62f Mon Sep 17 00:00:00 2001
From: flash631 <aswinmr006@gmail.com>
Date: Wed, 8 Apr 2026 17:18:20 -0500
Subject: [PATCH] Fix Step 5 3D plotting for modern Matplotlib

---
 lessons/07_Step_5.ipynb | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lessons/07_Step_5.ipynb b/lessons/07_Step_5.ipynb
index 1d3bfa8e..18e4e7c1 100644
--- a/lessons/07_Step_5.ipynb
+++ b/lessons/07_Step_5.ipynb
@@ -148,7 +148,7 @@
     "###Plot Initial Condition\n",
     "##the figsize parameter can be used to produce different sized images\n",
     "fig = pyplot.figure(figsize=(11, 7), dpi=100)\n",
-    "ax = fig.gca(projection='3d')                      \n",
+    "ax = fig.add_subplot(projection='3d')                      \n",
     "X, Y = numpy.meshgrid(x, y)                            \n",
     "surf = ax.plot_surface(X, Y, u[:], cmap=cm.viridis)\n",
     "\n"
@@ -188,7 +188,7 @@
    "source": [
     "```python\n",
     "fig = pyplot.figure(figsize=(11, 7), dpi=100)\n",
-    "ax = fig.gca(projection='3d')\n",
+    "ax = fig.add_subplot(projection='3d')\n",
     "surf2 = ax.plot_surface(X, Y, u[:])\n",
     "```"
    ]
@@ -271,7 +271,7 @@
     "            u[:, -1] = 1\n",
     "\n",
     "fig = pyplot.figure(figsize=(11, 7), dpi=100)\n",
-    "ax = fig.gca(projection='3d')\n",
+    "ax = fig.add_subplot(projection='3d')\n",
     "surf2 = ax.plot_surface(X, Y, u[:], cmap=cm.viridis)"
    ]
   },
@@ -317,7 +317,7 @@
     "    u[:, -1] = 1\n",
     "\n",
     "fig = pyplot.figure(figsize=(11, 7), dpi=100)\n",
-    "ax = fig.gca(projection='3d')\n",
+    "ax = fig.add_subplot(projection='3d')\n",
     "surf2 = ax.plot_surface(X, Y, u[:], cmap=cm.viridis)\n",
     "\n",
     "    "