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PERF: improve perf of float-based timeseries plotting #15073

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Merged
merged 4 commits into from
Jan 9, 2017
Merged

PERF: improve perf of float-based timeseries plotting #15073

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4fc0dca
PERF: improve perf of float-based timeseries plotting
jorisvandenbossche Jan 6, 2017
b36d034
add whatsnew
jorisvandenbossche Jan 6, 2017
3971d56
update test (return value is now array instead of index)
jorisvandenbossche Jan 6, 2017
a508a88
Merge branch 'master' into timeseries-plotting
jorisvandenbossche Jan 9, 2017
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3 changes: 3 additions & 0 deletions asv_bench/benchmarks/plotting.py
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Expand Up @@ -20,6 +20,9 @@ def setup(self):
def time_plot_regular(self):
self.df.plot()

def time_plot_regular_compat(self):
self.df.plot(x_compat=True)


class Misc(object):
goal_time = 0.6
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4 changes: 4 additions & 0 deletions doc/source/whatsnew/v0.20.0.txt
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Expand Up @@ -281,10 +281,14 @@ Performance Improvements

- Improved performance of ``pd.wide_to_long()`` (:issue:`14779`)
- Increased performance of ``pd.factorize()`` by releasing the GIL with ``object`` dtype when inferred as strings (:issue:`14859`)
- Improved performance of timeseries plotting with an irregular DatetimeIndex
(or with ``compat_x=True``) (:issue:`15073`).


- When reading buffer object in ``read_sas()`` method without specified format, filepath string is inferred rather than buffer object.



.. _whatsnew_0200.bug_fixes:

Bug Fixes
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2 changes: 1 addition & 1 deletion pandas/tseries/converter.py
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Expand Up @@ -212,7 +212,7 @@ def try_parse(values):
try:
values = tools.to_datetime(values)
if isinstance(values, Index):
values = values.map(_dt_to_float_ordinal)
values = _dt_to_float_ordinal(values)
else:
values = [_dt_to_float_ordinal(x) for x in values]
except Exception:
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6 changes: 3 additions & 3 deletions pandas/tseries/tests/test_converter.py
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Expand Up @@ -3,7 +3,7 @@
import nose

import numpy as np
from pandas import Timestamp, Period, Index
from pandas import Timestamp, Period
from pandas.compat import u
import pandas.util.testing as tm
from pandas.tseries.offsets import Second, Milli, Micro
Expand Down Expand Up @@ -104,8 +104,8 @@ def test_dateindex_conversion(self):
for freq in ('B', 'L', 'S'):
dateindex = tm.makeDateIndex(k=10, freq=freq)
rs = self.dtc.convert(dateindex, None, None)
xp = Index(converter.dates.date2num(dateindex._mpl_repr()))
tm.assert_index_equal(rs, xp, decimals)
xp = converter.dates.date2num(dateindex._mpl_repr())
tm.assert_almost_equal(rs, xp, decimals)

def test_resolution(self):
def _assert_less(ts1, ts2):
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