Merge pull request matplotlib#22824 from anntzer/ub

Remove some unnecessary extra boundaries for colorbars with extensions.

Author: oscargus

examples/specialty_plots/leftventricle_bulleye.py

@@ -171,8 +171,6 @@ def bullseye_plot(ax, data, seg_bold=None, cmap=None, norm=None):
 norm3 = mpl.colors.BoundaryNorm(bounds, cmap3.N)
 fig.colorbar(mpl.cm.ScalarMappable(cmap=cmap3, norm=norm3),
              cax=axl3,
-             # to use 'extend', you must specify two extra boundaries:
-             boundaries=[0] + bounds + [18],
              extend='both',
              ticks=bounds,  # optional
              spacing='proportional',

tutorials/colors/colorbar_only.py

@@ -77,8 +77,7 @@
 # `~.Figure.colorbar`. For the out-of-range values to display on the colorbar
 # without using the *extend* keyword with
 # `.colors.BoundaryNorm`, we have to use the *extend* keyword argument directly
-# in the colorbar call, and supply an additional boundary on each end of the
-# range.  Here we also
+# in the colorbar call.  Here we also
 # use the spacing argument to make
 # the length of each colorbar segment proportional to its corresponding
 # interval.
@@ -94,7 +93,6 @@
 fig.colorbar(
     mpl.cm.ScalarMappable(cmap=cmap, norm=norm),
     cax=ax,
-    boundaries=[0] + bounds + [13],  # Adding values for extensions.
     extend='both',
     ticks=bounds,
     spacing='proportional',
@@ -121,7 +119,6 @@
 fig.colorbar(
     mpl.cm.ScalarMappable(cmap=cmap, norm=norm),
     cax=ax,
-    boundaries=[-10] + bounds + [10],
     extend='both',
     extendfrac='auto',
     ticks=bounds,