From 1509655ed93e082d8c902323f3a278c53631b2a2 Mon Sep 17 00:00:00 2001
From: Drew Bednar <drew@runcible.io>
Date: Sun, 1 Feb 2026 10:02:20 -0500
Subject: [PATCH] Remove pylab examples

---
 README.md                           |  4 +++
 ch2_graphing/graphing_functions.py  |  2 +-
 ch2_graphing/simple_graphs.py       | 17 +++++-----
 ch2_graphing/temp_comparision_v2.py | 52 ++++++++++++++++++-----------
 ch2_graphing/temp_comparison.py     | 29 ++++++++++++----
 ch2_graphing/temp_decimal.py        | 20 +++++++----
 ch2_graphing/temp_graph.py          | 15 ++++++---
 7 files changed, 92 insertions(+), 47 deletions(-)

diff --git a/README.md b/README.md
index 442d1ac..99332b3 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,10 @@ Math is fun, but we generally learn applying it's operations with pencil and pap
 
 ## Installation
 
+```bash
+sudo apt install python3-tk
+```
+
 ```bash
 uv venv -p 3.12
 uv pip install -r requirements.in
diff --git a/ch2_graphing/graphing_functions.py b/ch2_graphing/graphing_functions.py
index 18d6443..cfcef2e 100644
--- a/ch2_graphing/graphing_functions.py
+++ b/ch2_graphing/graphing_functions.py
@@ -28,7 +28,7 @@ def generate_F_r():
     m2 = 1.5
 
     for dist in r:
-        force = G * (m1 / m2) / (dist ** 2)
+        force = G * (m1 * m2) / (dist ** 2)
         F.append(force)
 
     draw_graph(r, F)
diff --git a/ch2_graphing/simple_graphs.py b/ch2_graphing/simple_graphs.py
index da14455..3ecfb7a 100644
--- a/ch2_graphing/simple_graphs.py
+++ b/ch2_graphing/simple_graphs.py
@@ -1,17 +1,16 @@
 """
-Simple pylab example
+Simple matplotlib example
 
-Use pylab when you are in an interactive shell. This example really should be copied into a RPEL.
 """
 
-from pylab import plot, show
+import numpy as np
+import matplotlib.pyplot as plt
 
-x_numbers = [1, 2, 3]
-y_numbers = [2, 4, 6]
-
-my_graph = plot(x_numbers, y_numbers, marker='o')
-# my_graph = plot(x_numbers, y_numbers, 'o')
+x_numbers = np.array([1, 2, 3])
+y_numbers = np.array([2, 4, 6])
 
+fig, ax = plt.subplots()
+ax.plot(x_numbers, y_numbers, marker="o")
 
 if __name__ == "__main__":
-    show()
+    plt.show()
diff --git a/ch2_graphing/temp_comparision_v2.py b/ch2_graphing/temp_comparision_v2.py
index 08de9d5..6fcb4c8 100644
--- a/ch2_graphing/temp_comparision_v2.py
+++ b/ch2_graphing/temp_comparision_v2.py
@@ -1,20 +1,32 @@
-from pylab import legend, plot, show, title, xlabel, ylabel, axis
-
-nyc_temp_2000 = [31.3, 37.3, 47.2, 51.0, 63.5, 71.3, 72.3, 72.7, 66.0, 57.0, 45.3, 31.1]
-nyc_temp_2006 = [40.9, 35.7, 43.1, 55.7, 63.1, 71.0, 77.9, 75.8, 66.6, 56.2, 51.9, 43.6]
-nyc_temp_2012 = [37.3, 40.9, 50.9, 54.8, 65.1, 71.0, 78.8, 76.7, 68.8, 58.0, 43.9, 41.5]
-
-months = range(1, 13)
-
-plot(months, nyc_temp_2000, months, nyc_temp_2006, months, nyc_temp_2012)
-
-title('Average monthly temperature in NYC')
-
-xlabel("Month")
-ylabel("Temperature")
-
-legend([2000, 2006, 2012])
-
-axis(ymin=0)
-
-show()
\ No newline at end of file
+import numpy as np
+import matplotlib.pyplot as plt
+
+nyc_temp_2000 = np.array([
+    31.3, 37.3, 47.2, 51.0, 63.5, 71.3,
+    72.3, 72.7, 66.0, 57.0, 45.3, 31.1
+])
+nyc_temp_2006 = np.array([
+    40.9, 35.7, 43.1, 55.7, 63.1, 71.0,
+    77.9, 75.8, 66.6, 56.2, 51.9, 43.6
+])
+nyc_temp_2012 = np.array([
+    37.3, 40.9, 50.9, 54.8, 65.1, 71.0,
+    78.8, 76.7, 68.8, 58.0, 43.9, 41.5
+])
+
+months = np.arange(1, 13)
+
+fig, ax = plt.subplots()
+
+ax.plot(months, nyc_temp_2000, marker="o", label="2000")
+ax.plot(months, nyc_temp_2006, marker="o", label="2006")
+ax.plot(months, nyc_temp_2012, marker="o", label="2012")
+
+ax.set_title("Average monthly temperature in NYC")
+ax.set_xlabel("Month")
+ax.set_ylabel("Temperature")
+
+ax.set_ylim(bottom=0)   # equivalent to axis(ymin=0)
+ax.legend()
+
+plt.show()
diff --git a/ch2_graphing/temp_comparison.py b/ch2_graphing/temp_comparison.py
index 1be6488..c5dfda1 100644
--- a/ch2_graphing/temp_comparison.py
+++ b/ch2_graphing/temp_comparison.py
@@ -1,13 +1,28 @@
-from pylab import legend, plot, show
+import numpy as np
+import matplotlib.pyplot as plt
 
-nyc_temp_2000 = [31.3, 37.3, 47.2, 51.0, 63.5, 71.3, 72.3, 72.7, 66.0, 57.0, 45.3, 31.1]
-nyc_temp_2006 = [40.9, 35.7, 43.1, 55.7, 63.1, 71.0, 77.9, 75.8, 66.6, 56.2, 51.9, 43.6]
-nyc_temp_2012 = [37.3, 40.9, 50.9, 54.8, 65.1, 71.0, 78.8, 76.7, 68.8, 58.0, 43.9, 41.5]
+nyc_temp_2000 = [
+    31.3, 37.3, 47.2, 51.0, 63.5, 71.3,
+    72.3, 72.7, 66.0, 57.0, 45.3, 31.1
+]
+nyc_temp_2006 = [
+    40.9, 35.7, 43.1, 55.7, 63.1, 71.0,
+    77.9, 75.8, 66.6, 56.2, 51.9, 43.6
+]
+nyc_temp_2012 = [
+    37.3, 40.9, 50.9, 54.8, 65.1, 71.0,
+    78.8, 76.7, 68.8, 58.0, 43.9, 41.5
+]
 
 months = range(1, 13)
 
-plot(months, nyc_temp_2000, months, nyc_temp_2006, months, nyc_temp_2012)
+plt.plot(months, nyc_temp_2000)
+plt.plot(months, nyc_temp_2006)
+plt.plot(months, nyc_temp_2012)
 
-legend([2000, 2006, 2012])
+plt.legend([2000, 2006, 2012])
+plt.xlabel("Month")
+plt.ylabel("Temperature")
+plt.title("NYC Monthly Temperatures")
 
-show()
\ No newline at end of file
+plt.show()
diff --git a/ch2_graphing/temp_decimal.py b/ch2_graphing/temp_decimal.py
index 5817e8e..ca7d855 100644
--- a/ch2_graphing/temp_decimal.py
+++ b/ch2_graphing/temp_decimal.py
@@ -1,12 +1,20 @@
-from pylab import plot, show
+import numpy as np
+import matplotlib.pyplot as plt
 from decimal import Decimal
 
-nyc_temp = [50.9, 60.3, 54.4, 52.4, 51.5, 52.8, 56.8, 55.0, 55.3, 54.0, 56.7, 56.4, 57.3]
+nyc_temp = [
+    50.9, 60.3, 54.4, 52.4, 51.5, 52.8,
+    56.8, 55.0, 55.3, 54.0, 56.7, 56.4, 57.3
+]
 
-dec_nyc_temp = list(map(lambda x: Decimal(str(x)), nyc_temp))
+# Preserve Decimal behavior
+dec_nyc_temp = [Decimal(str(x)) for x in nyc_temp]
 
-years = range(2000, 2013)
+years = list(range(2000, 2013))
 
-plot(years, dec_nyc_temp, marker='o')
+plt.plot(years, dec_nyc_temp, marker="o")
+plt.xlabel("Year")
+plt.ylabel("Temperature")
+plt.title("NYC Temperature by Year")
 
-show()
\ No newline at end of file
+plt.show()
diff --git a/ch2_graphing/temp_graph.py b/ch2_graphing/temp_graph.py
index 263b5ef..21e5539 100644
--- a/ch2_graphing/temp_graph.py
+++ b/ch2_graphing/temp_graph.py
@@ -1,7 +1,14 @@
-from pylab import plot, show
+import numpy as np
+import matplotlib.pyplot as plt
 
-nyc_temp = [53.9, 56.3, 56.4, 53.4, 54.5, 55.8, 56.8, 55.0, 55.3, 54.0, 56.7, 56.4, 57.3]
+nyc_temp = np.array([
+    53.9, 56.3, 56.4, 53.4, 54.5, 55.8,
+    56.8, 55.0, 55.3, 54.0, 56.7, 56.4, 57.3
+])
 
-plot(nyc_temp, marker="o")
+plt.plot(nyc_temp, marker="o")
+plt.xlabel("Day")
+plt.ylabel("Temperature (°F)")
+plt.title("NYC Temperatures")
 
-show()
\ No newline at end of file
+plt.show()