BUG: incorrect tick label positions #1531 (zooming is still wrong)

Author: Chang She

pandas/tools/plotting.py

@@ -461,9 +461,12 @@ def _adorn_subplots(self):
                 self.ax.set_title(self.title)
 
         if self._need_to_set_index:
-            xticklabels = [_stringify(key) for key in self.data.index]
+            labels = [_stringify(key) for key in self.data.index]
+            labels = dict(zip(range(len(self.data.index)), labels))
+
             for ax_ in self.axes:
                 # ax_.set_xticks(self.xticks)
+                xticklabels = [labels.get(x, '') for x in ax_.get_xticks()]
                 ax_.set_xticklabels(xticklabels, rotation=self.rot)
 
     @property
@@ -575,7 +578,7 @@ def _post_plot_logic(self):
         if self.subplots and self.legend:
             self.axes[0].legend(loc='best')
 
-try:
+try: # matplotlib is optional dependency
     import matplotlib.units as units
     import matplotlib.dates as dates
 
@@ -663,6 +666,7 @@ def _make_plot(self):
                 if mask.any():
                     y = np.ma.array(y)
                     y = np.ma.masked_where(mask, y)
+
                 plotf(ax, x, y, style, label=label, **self.kwds)
                 ax.grid(self.grid)
 

pandas/tseries/tests/test_plotting.py

@@ -561,6 +561,7 @@ def test_from_weekly_resampling(self):
 
     @slow
     def test_irreg_dtypes(self):
+        import matplotlib.pyplot as plt
         #date
         idx = [date(2000, 1, 1), date(2000, 1, 5), date(2000, 1, 20)]
         df = DataFrame(np.random.randn(len(idx), 3), Index(idx, dtype=object))
@@ -573,10 +574,16 @@ def test_irreg_dtypes(self):
         _check_plot_works(df.plot)
 
         #time
-        inc = Series(np.random.randint(1, 6, 9)).cumsum().values
+        plt.close('all')
+        inc = Series(np.random.randint(1, 15, 3)).cumsum().values
         idx = [time(1, 1, i) for i in inc]
         df = DataFrame(np.random.randn(len(idx), 3), idx)
-        _check_plot_works(df.plot)
+        ax = df.plot()
+        ticks = ax.get_xticks()
+        labels = ax.get_xticklabels()
+        td = dict(zip(ticks, labels))
+        for i in range(3):
+            self.assert_(td[i].get_text() == str(idx[i]))
 
 PNG_PATH = 'tmp.png'
 def _check_plot_works(f, freq=None, series=None, *args, **kwargs):