Merge pull request matplotlib#15709 from anntzer/3dplotscalar

Make 3d plot accept scalars as arguments.

Author: story645

lib/mpl_toolkits/mplot3d/axes3d.py

@@ -1435,7 +1435,7 @@ def plot(self, xs, ys, *args, zdir='z', **kwargs):
             zs = kwargs.pop('zs', 0)
 
         # Match length
-        zs = np.broadcast_to(zs, len(xs))
+        zs = np.broadcast_to(zs, np.shape(xs))
 
         lines = super().plot(xs, ys, *args, **kwargs)
         for line in lines:

lib/mpl_toolkits/tests/test_mplot3d.py

@@ -160,6 +160,14 @@ def test_lines3d():
     ax.plot(x, y, z)
 
 
+@check_figures_equal(extensions=["png"])
+def test_plot_scalar(fig_test, fig_ref):
+    ax1 = fig_test.gca(projection='3d')
+    ax1.plot([1], [1], "o")
+    ax2 = fig_ref.gca(projection='3d')
+    ax2.plot(1, 1, "o")
+
+
 @image_comparison(['mixedsubplot.png'], remove_text=True)
 def test_mixedsubplots():
     def f(t):