From 573d5bf4a975baef4293fc51e2419e6f8fba5d0a Mon Sep 17 00:00:00 2001
From: BaoGiang HoangVu <hoangvubaogiang@gmail.com>
Date: Mon, 26 Oct 2020 20:09:14 +0700
Subject: [PATCH 1/3] extend linear regression lines to the entire length of
 plots in Anscombe's Quartet example

---
 examples/specialty_plots/anscombe.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/specialty_plots/anscombe.py b/examples/specialty_plots/anscombe.py
index 30e880882942..f033f717f10c 100644
--- a/examples/specialty_plots/anscombe.py
+++ b/examples/specialty_plots/anscombe.py
@@ -41,7 +41,7 @@
 
     # linear regression
     p1, p0 = np.polyfit(x, y, deg=1)
-    x_lin = np.array([np.min(x), np.max(x)])
+    x_lin = np.array([0, 20])
     y_lin = p1 * x_lin + p0
     ax.plot(x_lin, y_lin, 'r-', lw=2)
 

From 1531619e7d21fdb119f5ca23194016ca94bbc5c9 Mon Sep 17 00:00:00 2001
From: BaoGiang HoangVu <hoangvubaogiang@gmail.com>
Date: Mon, 26 Oct 2020 22:22:17 +0700
Subject: [PATCH 2/3] draw regression lines with `axline`

---
 examples/specialty_plots/anscombe.py | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/examples/specialty_plots/anscombe.py b/examples/specialty_plots/anscombe.py
index f033f717f10c..e1442d063c2e 100644
--- a/examples/specialty_plots/anscombe.py
+++ b/examples/specialty_plots/anscombe.py
@@ -40,10 +40,8 @@
     ax.plot(x, y, 'o')
 
     # linear regression
-    p1, p0 = np.polyfit(x, y, deg=1)
-    x_lin = np.array([0, 20])
-    y_lin = p1 * x_lin + p0
-    ax.plot(x_lin, y_lin, 'r-', lw=2)
+    p1, p0 = np.polyfit(x, y, deg=1)  # slope, intercept
+    ax.axline(xy1=(0, p0), slope=p1, color='r', lw=2)
 
     # add text box for the statistics
     stats = (f'$\\mu$ = {np.mean(y):.2f}\n'

From 191b7b2f506a73baeffb9217e02860014a0cce8b Mon Sep 17 00:00:00 2001
From: BaoGiang HoangVu <hoangvubaogiang@gmail.com>
Date: Mon, 26 Oct 2020 23:10:11 +0700
Subject: [PATCH 3/3] add references

---
 examples/specialty_plots/anscombe.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/examples/specialty_plots/anscombe.py b/examples/specialty_plots/anscombe.py
index e1442d063c2e..93390907f7b3 100644
--- a/examples/specialty_plots/anscombe.py
+++ b/examples/specialty_plots/anscombe.py
@@ -52,3 +52,18 @@
             transform=ax.transAxes, horizontalalignment='right')
 
 plt.show()
+
+#############################################################################
+#
+# ------------
+#
+# References
+# """"""""""
+#
+# The use of the following functions, methods, classes and modules is shown
+# in this example:
+
+import matplotlib
+matplotlib.axes.Axes.axline
+matplotlib.axes.Axes.text
+matplotlib.axes.Axes.tick_params