From 2b4be36ac8951db60908e5a0b05a03acf442bcb1 Mon Sep 17 00:00:00 2001
From: vas1l <116816275+vas1l@users.noreply.github.com>
Date: Thu, 26 Sep 2024 19:57:54 +0000
Subject: [PATCH 1/2] Rotation for theta now includes + np.pi / 2 to adjust the
 cap properly, sign of y axis condition was adjusted to align properly

---
 lib/matplotlib/axes/_axes.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index de0c6854cbb1..9bca8164ac38 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -3770,9 +3770,9 @@ def apply_mask(arrays, mask):
                 for l in caplines[axis]:
                     # Rotate caps to be perpendicular to the error bars
                     for theta, r in zip(l.get_xdata(), l.get_ydata()):
-                        rotation = mtransforms.Affine2D().rotate(theta)
+                        rotation = mtransforms.Affine2D().rotate(theta + np.pi / 2)
                         if axis == 'y':
-                            rotation.rotate(-np.pi / 2)
+                            rotation.rotate(np.pi / 2)#changed sign on "np.pi"
                         ms = mmarkers.MarkerStyle(marker=marker,
                                                   transform=rotation)
                         self.add_line(mlines.Line2D([theta], [r], marker=ms,

From a1f399d939b57e0b20b80e83b8af6f739b6251df Mon Sep 17 00:00:00 2001
From: vas1l <116816275+vas1l@users.noreply.github.com>
Date: Wed, 2 Oct 2024 19:12:26 +0000
Subject: [PATCH 2/2] polar error bar fix

---
 lib/matplotlib/axes/_axes.py |  2 +-
 test.py                      | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 test.py

diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index 9bca8164ac38..eedef7230944 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -3770,7 +3770,7 @@ def apply_mask(arrays, mask):
                 for l in caplines[axis]:
                     # Rotate caps to be perpendicular to the error bars
                     for theta, r in zip(l.get_xdata(), l.get_ydata()):
-                        rotation = mtransforms.Affine2D().rotate(theta + np.pi / 2)
+                        rotation = mtransforms.Affine2D().rotate(theta + np.pi / 2) #changed rotation coefficient
                         if axis == 'y':
                             rotation.rotate(np.pi / 2)#changed sign on "np.pi"
                         ms = mmarkers.MarkerStyle(marker=marker,
diff --git a/test.py b/test.py
new file mode 100644
index 000000000000..964971a37c3d
--- /dev/null
+++ b/test.py
@@ -0,0 +1,14 @@
+
+import matplotlib.pyplot as plt
+import numpy as np
+
+theta = np.arange(0, 2 * np.pi, np.pi / 8)
+r = theta / np.pi / 2 + 0.5
+
+fig = plt.figure(figsize=(10, 10))
+ax = fig.add_subplot(projection='polar')
+ax.set_theta_zero_location("N")
+ax.set_theta_direction(-1)
+ax.errorbar(theta, r, xerr=0.1, yerr=0.1, capsize=7, fmt="o", c="seagreen")
+ax.set_title("Pretty polar error bars")
+plt.show()
\ No newline at end of file