Goyo wrote:
> Hi all,
>
> I'm plotting time series and using a custom format for x tick labels
> because I want to see both date and time. But calling xlim makes the
> default format return -- only dates or only times, it depends on the
> displayed interval.
>
> I can get my preferred format back by calling set_major_formatter again,
> but this is inconvenient for interactive use.
>
> I wonder if there is a better way for changing x limits while keeping
> tick labels format unchanged.
>
> I'm using matplotlib 0.98.3
>
> Thanks
>
> Goyo
>
>
> Sample code -- you need a combination of python shell and matplotlib GUI
> which allows for interactive use in order to get this working as
> expected:
>
> ----------------------------------------
>
> from matplotlib import pyplot
> from matplotlib import dates
> from datetime import datetime, timedelta
> from numpy import random
>
> pyplot.ion()
>
> # create data
> dstart = datetime(2008, 1, 1, 0, 0)
> dend = datetime(2008, 1, 5, 23, 50)
> delta = timedelta(minutes=10)
> x = dates.drange(dstart, dend, delta)
> y = random.random_sample(len(x))
>
> # plot data
> pyplot.plot(x, y)
>
> # format x tick labels
> axis = pyplot.gca()
> fig = pyplot.gcf()
> axis.xaxis.set_major_formatter(dates.DateFormatter('%Y-%b-%d %H:%M'))
> fig.autofmt_xdate()
>
> # draw the figure
> pyplot.draw()
>
> --------------------------------------
>
> Look at the tick labels, they show both date and time even if you zoom
> and pan using the GUI.
>
> Now if I want to look at the second day:
>
> dstart = datetime(2008, 1, 1, 0, 0)
> dend = datetime(2008, 1, 1, 23, 50)
> pyplot.xlim(dstart, dend)
>
> And the format has changed.
I don't see this problem using ipython -pylab with mpl from svn on
linux, gtkagg backend. What version, backend, and platform are you using?
Eric
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