twiny to pylab

jdh2358 · jdh2358 · commit 531226677089 · 2007-02-13T15:29:16.000Z
svn path=/trunk/matplotlib/; revision=3015
diff --git a/CHANGELOG b/CHANGELOG
@@ -1,12 +1,12 @@
+2006-02-13 Added twiny to pylab - JDH
+
 2006-02-12 Moved data files into lib/matplotlib so that setuptools'
            develop mode works. Re-organized the mpl-data layout so
            that this source structure is maintained in the
            installation. (I.e. the 'fonts' and 'images'
            sub-directories are maintained in site-packages.)  Suggest
            removing site-packages/matplotlib/mpl-data and
-           ~/.matplotlib/ttffont.cache before installing
-
-- ADS
+           ~/.matplotlib/ttffont.cache before installing - ADS
 
 2006-02-07 Committed Rob Hetland's patch for qt4: remove 
            references to text()/latin1(), plus some improvements 
diff --git a/lib/matplotlib/pylab.py b/lib/matplotlib/pylab.py
@@ -1029,6 +1029,23 @@ def twinx(ax=None):
     return ax2
 
 
+def twiny(ax=None):
+    """
+    Make a second axes overlay ax (or the current axes if ax is None)
+    sharing the yaxis.  The ticks for ax2 will be placed on the top,
+    and the ax2 instance is returned.  
+    """
+    if ax is None:
+        ax=gca()
+
+
+    ax2 = gcf().add_axes(ax.get_position(), sharey=ax, frameon=False)
+    ax2.xaxis.tick_top()
+    ax2.xaxis.set_label_position('top')
+    ax.xaxis.tick_bottom()
+    draw_if_interactive()
+    return ax2
+
 def title(s, *args, **kwargs):
     """
     Set the title of the current axis to s
