BUG: fixing tseries plot cursor display, resolves #5453

Author: rosnfeld

doc/source/release.rst

@@ -450,8 +450,9 @@ Bug Fixes
 - Bug in enabling ``subplots=True`` in ``DataFrame.plot`` only has single column raises ``TypeError``, and ``Series.plot`` raises ``AttributeError`` (:issue:`6951`)
 - Bug in ``DataFrame.plot`` draws unnecessary axes when enabling ``subplots`` and ``kind=scatter`` (:issue:`6951`)
 - Bug in ``read_csv`` from a filesystem with non-utf-8 encoding (:issue:`6807`)
-- Bug in ``iloc`` when setting / aligning (:issue:``6766`)
+- Bug in ``iloc`` when setting / aligning (:issue:`6766`)
 - Bug causing UnicodeEncodeError when get_dummies called with unicode values and a prefix (:issue:`6885`)
+- Bug in timeseries-with-frequency plot cursor display (:issue:`5453`)
 
 pandas 0.13.1
 -------------

pandas/tseries/plotting.py

@@ -83,8 +83,7 @@ def tsplot(series, plotf, **kwargs):
     ax.set_xlim(left, right)
 
     # x and y coord info
-    tz = series.index.to_datetime().tz
-    ax.format_coord = lambda t, y : "t = {}    y = {:8f}".format(datetime.fromtimestamp(t, tz), y)
+    ax.format_coord = lambda t, y: "t = {}  y = {:8f}".format(Period(ordinal=int(t), freq=ax.freq), y)
 
     return lines
 

pandas/tseries/tests/test_plotting.py

@@ -131,6 +131,21 @@ def test_get_datevalue(self):
         self.assertEqual(get_datevalue('1/1/1987', 'D'),
                          Period('1987-1-1', 'D').ordinal)
 
+    @slow
+    def test_ts_plot_format_coord(self):
+        def check_format_of_first_point(ax, expected_string):
+            first_line = ax.get_lines()[0]
+            first_x = first_line.get_xdata()[0].ordinal
+            first_y = first_line.get_ydata()[0]
+            self.assertEqual(expected_string, ax.format_coord(first_x, first_y))
+
+        annual = Series(1, index=date_range('2014-01-01', periods=3, freq='A-DEC'))
+        check_format_of_first_point(annual.plot(), 't = 2014  y = 1.000000')
+
+        # note this is added to the annual plot already in existence, and changes its freq field
+        daily = Series(1, index=date_range('2014-01-01', periods=3, freq='D'))
+        check_format_of_first_point(daily.plot(), 't = 2014-01-01  y = 1.000000')
+
     @slow
     def test_line_plot_period_series(self):
         for s in self.period_ser: