Re: [Matplotlib-users] MonthLocator doesn't honour rrule bymonthday -1 value for last day of month

[Phil E. <pel...@gm...>]

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...> 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 GoogleCrap™ please read this
> http://wiki.python.org/moin/GoogleGroupsPython.
>
> Mark Lawrence
>
>
>
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