Added cross-references between symlog and asinh demo pages

Author: rwpenney

examples/scales/asinh_demo.py

@@ -95,5 +95,12 @@
 ax.set_ylim(-50, 50)
 ax.grid()
 
-
 plt.show()
+
+########################################
+#
+# .. admonition:: References
+#
+#    - `matplotlib.scale.AsinhScale`
+#    - `matplotlib.ticker.AsinhLocator`
+#    - `matplotlib.scale.SymmetricalLogScale`

examples/scales/symlog_demo.py

@@ -33,3 +33,17 @@
 
 fig.tight_layout()
 plt.show()
+
+########################################
+# It should be noted that the coordinate transform used by ``symlog``
+# has a discontinuous gradient at the transition between its linear
+# and logarithmic regions. The ``asinh`` axis scale is an alternative
+# technique that may avoid visual artifacts caused by these disconinuities.
+
+########################################
+#
+# .. admonition:: References
+#
+#    - `matplotlib.scale.SymmetricalLogScale`
+#    - `matplotlib.ticker.SymmetricalLogLocator`
+#    - `matplotlib.scale.AsinhScale`

lib/matplotlib/tests/test_scale.py

@@ -257,9 +257,9 @@ def test_base_init(self):
         assert s3._base == 3
         assert s3._subs == (2,)
 
-        s7 = AsinhScale(axis=None, base=7)
+        s7 = AsinhScale(axis=None, base=7, subs=(2, 4))
         assert s7._base == 7
-        assert s7._subs == (2, 5)
+        assert s7._subs == (2, 4)
 
     def test_bad_scale(self):
         fig, ax = plt.subplots()