matplotlib-users Mailing List for matplotlib

I've found the solution. MonthLocator doesn't support the bysetpos 
argument that rrule can use. Thankfully from my POV the following two 
lines give me exactly what I want.
rule = rrulewrapper(MONTHLY, bymonthday=(firstDate.day, -1), bysetpos=1)
majorLocator = RRuleLocator(rule)
Just wish I'd read the docs more carefully in the first place to save my 
time and yours.
On 05/04/2013 10:17, Mark Lawrence wrote:
> On 04/04/2013 19:00, Mark Lawrence wrote:
>> Sadly no :( I want the day of the month that I'm processing *OR* the
>> last day. The worst case for this is obviously the 31st of each month.
>> The rrule code I've given provides exactly that. When transferred to
>> mpl that doesn't work.
>
> Best seen by changing the lines I gave originally to this.
>
> start = datetime.date(2013, 4, 5)
> until = datetime.date(2014, 4, 5)
> dates = rrule(MONTHLY, bymonthday=(5, -1), bysetpos=1, until=until)
>
> rrule output as follows.
>
> 2013年04月05日 10:15:24
> 2013年05月05日 10:15:24
> 2013年06月05日 10:15:24
> 2013年07月05日 10:15:24
> 2013年08月05日 10:15:24
> 2013年09月05日 10:15:24
> 2013年10月05日 10:15:24
> 2013年11月05日 10:15:24
> 2013年12月05日 10:15:24
> 2014年01月05日 10:15:24
> 2014年02月05日 10:15:24
> 2014年03月05日 10:15:24
>
> Plot attached.
>
>>
>> On 04/04/2013 17:31, Phil Elson wrote:
>>> Hi Mark,
>>>
>>> Thanks for persevering :-)
>>>
>>> What is it you want to achieve? Is it that you just want the last day of
>>> each month as the located value?
>>>
>>> Changing your locator to:
>>>
>>> ax.xaxis.set_major_locator(MonthLocator(bymonthday = -1))
>>>
>>> Seems to do the trick for me (I've never looked at the mpl date magic,
>>> so I can give no guarantees).
>>>
>>> HTH,
>>>
>>>
>>> On 4 April 2013 17:18, Mark Lawrence
>>> <bre...@ya...
>>> <mailto:bre...@ya...>> wrote:
>>>
>>> On 01/04/2013 14:48, Mark Lawrence wrote:
>>> > On 29/03/2013 15:49, Mark Lawrence wrote:
>>> >> Hi all,
>>> >>
>>> >> From http://labix.org/python-dateutil
>>> >>
>>> >> "To generate a rrule for the use case of "a date on the
>>> specified day of
>>> >> the month, unless it is beyond the end of month, in which case
>>> it will
>>> >> be the last day of the month" use the following:
>>> >>
>>> >> rrule(MONTHLY, bymonthday=(some_day, -1), bysetpos=1)
>>> >>
>>> >> This will generate a value for every calendar month regardless
>>> of the
>>> >> day of the month it is started from."
>>> >>
>>> >> Using bymonthday with MonthLocator gives ticks on the day given
>>> and the
>>> >> last day of the month, which looks extremely ugly. Code below
>>> demonstrates.
>>> >>
>>> >> from dateutil.rrule import *
>>> >> import datetime
>>> >> import matplotlib.pyplot as plt
>>> >> from matplotlib.ticker import FormatStrFormatter,
>>> MultipleLocator
>>> >> from matplotlib.dates import DateFormatter, MonthLocator,
>>> DayLocator
>>> >>
>>> >> start = datetime.date(2013, 3, 29)
>>> >> until = datetime.date(2014, 3, 29)
>>> >> dates = rrule(MONTHLY, bymonthday=(29, -1), bysetpos=1,
>>> until=until)
>>> >> for d in dates:print(d)
>>> >>
>>> >> dates = [start, until]
>>> >> values = [0, 1]
>>> >> plt.ylabel('Balance')
>>> >> plt.grid()
>>> >> ax = plt.subplot(111)
>>> >> plt.plot_date(dates, values, fmt = 'rx-')
>>> >> ax.xaxis.set_major_locator(MonthLocator(bymonthday =
>>> (dates[0].day, -1)))
>>> >> 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.axis(xmin=dates[0], xmax=dates[-1])
>>> >> plt.setp(plt.gca().get_xticklabels(), rotation = 45,
>>> fontsize = 10)
>>> >> plt.setp(plt.gca().get_yticklabels(), fontsize = 10)
>>> >> plt.show()
>>> >>
>>> >
>>> > Seems an apt date to realise that I didn't say much :(
>>> >
>>> > Assuming that I'm correct would you like an issue raised on
>>> the bug
>>> > tracker? If not please correct the mistake I've made,
>>> presumably in
>>> > reading the docs, which I think are excellent by the way.
>>> >
>>>
>>> Anybody?
>>>
>>> --
>>> If you're using GoogleCrapTM please read this
>>> http://wiki.python.org/moin/GoogleGroupsPython.
>>>
>>
-- 
If you're using GoogleCrapTM please read this 
http://wiki.python.org/moin/GoogleGroupsPython.
Mark Lawrence

hi, every one:
I used to use TkAgg as backend on my macbook for matplotlib which was
installed from macports. for a while, the plot window was launched in X11.
after a latest macports update, it stopped using x11 instead a standalone
python window will be used now.
I was wondering if there is a way to instruct matplotlib to open plot
window in x11? thanks!
-- 
Randy