On Sat, Jul 11, 2009 at 1:15 PM, Eric Firing<efir...@hawaii.edu> wrote:
> John Hunter wrote:
>>
>> On Thu, Jul 9, 2009 at 9:44 AM, Johann Cohen-Tanugi<co...@lpta.in2p3.fr>
>> wrote:
>>>
>>> Hello, how can I center axis tick labels, so that the labels ends up at
>>> the center between 2 ticks.
>>>
>>
>> There is no support for this, though you can left or right align a
>> label with a single tick::
>>
>> for label in ax.xaxis.get_xticklabels():
>> label.set_horizontalalignment('right')
>>
>> JDH
>
> Labels for intervals rather than ticks would be nice to have; this is
> commonly used for labeling months or years, for example. I don't have time
> to work on it now, unfortunately.
>
> The best way to fake it with present facilities might be to use no labels on
> the major ticks, place minor ticks half-way between the majors, set their
> lengths to zero, and label them.
Nice idea, just committed this example to svn as
examples/pylab_examples/centered_ticklabels.py
import datetime
import numpy as np
import matplotlib
import matplotlib.dates as dates
import matplotlib.ticker as ticker
import matplotlib.pyplot as plt
# load some financial data; apple's stock price
fh = matplotlib.get_example_data('aapl.npy')
r = np.load(fh); fh.close()
r = r[-250:] # get the last 250 days
fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot(r.date, r.adj_close)
ax.xaxis.set_major_locator(dates.MonthLocator())
ax.xaxis.set_minor_locator(dates.MonthLocator(bymonthday=15))
ax.xaxis.set_major_formatter(ticker.NullFormatter())
ax.xaxis.set_minor_formatter(dates.DateFormatter('%b'))
for tick in ax.xaxis.get_minor_ticks():
tick.tick1line.set_markersize(0)
tick.tick2line.set_markersize(0)
tick.label1.set_horizontalalignment('center')
imid = len(r)/2
ax.set_xlabel(str(r.date[imid].year))
plt.show()
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