On Tue, Mar 19, 2013 at 11:30 AM, Paul Hobson <pmhob...@gmail.com> wrote:
> On Mon, Mar 18, 2013 at 8:34 PM, Mark Lawrence <breamore...@yahoo.co.uk>wrote:
>
>> Matplotlib 1.2.0, Windows Vista, Python 3.3.0. I want the first major
>> xtick label aligned with the first date that's plotted. This never
>> happens with the value of day below set in the range zero to six. The
>> first major tick label actually occurs as follows.
>>
>> Day Label date
>> 0 25/03/2013
>> 1 02/04/2013
>> 2 10/04/2013
>> 3 21/03/2013
>> 4 29/03/2013
>> 5 06/04/2013
>> 6 17/03/2013
>>
>> What am I doing wrong?
>>
>> If day is set to seven then no xticks are displayed but labels for
>> 14/03/2013 and 13/03/2014 are displayed. I expected a ValueError or
>> similar using this number. Could you explain this behaviour please?
>>
>> import matplotlib.pyplot as plt
>> from matplotlib.ticker import FormatStrFormatter, MultipleLocator
>> from matplotlib.dates import DateFormatter, WeekdayLocator
>> import datetime
>>
>> dates = [datetime.date(2013, 3, 14), datetime.date(2014, 3, 13)]
>> values = [0, 1]
>> plt.ylabel('Balance')
>> plt.grid()
>> ax = plt.subplot(111)
>> plt.plot_date(dates, values, fmt = 'rx-')
>> plt.axis(xmin=dates[0], xmax=dates[-1])
>> day = ?
>> ax.xaxis.set_major_locator(WeekdayLocator(byweekday=day, interval=4))
>> ax.xaxis.set_minor_locator(WeekdayLocator(byweekday=day))
>> ax.xaxis.set_major_formatter(DateFormatter('%d/%m/%y'))
>> ax.yaxis.set_major_formatter(FormatStrFormatter('£%0.2f'))
>> ax.yaxis.set_minor_locator(MultipleLocator(5))
>> plt.setp(plt.gca().get_xticklabels(), rotation = 45, fontsize = 10)
>> plt.setp(plt.gca().get_yticklabels(), fontsize = 10)
>> plt.show()
>>
>>
> Mark,
>
> I've found that rotation_mode='anchor' works best when rotation != 0
>
> So that makes it:
> plt.setp(plt.gca().get_xticklabels(), rotation = 45, fontsize = 10,
> rotation_mode='anchor' )
>
> HTH,
> -paul
>
I misread your question. Try setting your x-axis limits after defining the
locators and formatters.
-p
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