thanks a lot!
Johann
John Hunter wrote:
> 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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