Re: [Matplotlib-users] But report: Date axis formatter problem

[Jianbao T. <jia...@gm...>]

Bug to the bug report: In the subject, it should be 'Bug report', rather
than 'But report'. Oops :-(

Jianbao

On Mon, Oct 8, 2012 at 9:37 AM, Jianbao Tao <jia...@gm...> wrote:

> Problem: The autodatelocator and autodateformatter don't seem to work
> properly. One, the formatter doesn't seem to work immediately after being
> applied to an axis. A manual call to the locator seems necessary. Two, the
> autodatelocator doesn't seem to be able to handle view intervals less than
> 1 second, i.e., the tick labels don't show digits beyond second. You can
> see this by zooming the example figure from the code below to a level
> shorter than one second.
>
> 1. Operating system: OS X 10.8.2
> 2. matplotlib version: 1.2.0rc2
> 3. I installed matplotlib via:
>
> pip install git+https://github.com/matplotlib/matplotlib.git#egg=matplotlib-dev
>
> 4. Backend: TkAgg, but I don't think the problem depends on the backend.
> 5. Code:
> #--------------------------------- code
> -----------------------------------------------------
> # Running in ipython --pylab mode.
> fig = figure()
> tsta = num2epoch(date2num(datetime.datetime.now()))
> tarr = tsta + arange(0, 60*30., 0.01) # half hour, dt = 0.01 sec
> x = np.array(num2date(epoch2num(tarr)))
> nt = len(tarr)
> y = randn(nt)
>
> ax = fig.add_subplot(111)
> ax.plot(x, y)
> fig.canvas.draw()  # Show an overall view of the data
>
>
> locator = mpl.dates.AutoDateLocator()
> formatter = mpl.dates.AutoDateFormatter(locator)
>
> formatter.scaled = {
>     365.0 : '%Y',
>     30. : '%b %Y',
>     1.0 : '%b %d',
>     1./24. : '%H:%M',
>     1./24./60. : '%M:%S',
>     1./24./60./60. : '%S',
> }
> ax.get_xaxis().set_major_formatter(formatter)  # Won't work immediately.
> locator.set_axis(ax.xaxis) # Have to manually make this call and the one
> below.
> locator.refresh()               # Another manual call.
> fig.canvas.draw()
> #------------------------------------ end of code
> --------------------------------------------------------
>
>