Hi,
I'm not a frequent user of matplotlib.dates module, so other expert
may give you a better answer.
My understanding is that, for the date time formatting, the (x-) data
needs to be days (if not datetime instance) from some reference point
(1, 1, 1? I'm not sure).
The easiest way I can think of in your case is
from matplotlib.dates import datetime, SEC_PER_DAY
ordinal_today=datetime.datetime.today().toordinal()
xvals = ordinal_today + np.arange(1200, dtype="d")/SEC_PER_DAY
Also, you'd better comment out the set_minor_locator and
set_minot_formatter calls, unless you want the same x-label drawn
twice.
IHTH,
-JJ
On Tue, Apr 7, 2009 at 3:47 PM, Brian Zambrano <bri...@gmail.com> wrote:
> He there,
>
> I'm new to matplotlib but have really been appreciating the thorough
> documentation and examples online. I've never worked with matlab either so
> I'm stumbling my way around a bit, but have managed to get some basic plots
> working with my wxPython program.
>
> I'm plotting some simple time/temp curves. For the time, I have just the
> number of seconds, starting at 0 and going up to about 1200 (20 minutes).
> I'm trying to format the xaxis so that there is a tick mark every one
> minute, and format the tick marks so they display %M:%S. The code below
> doesn't give me *any* formatting or tick marks on the xaxis. It seems like
> this should be fairly obvious how to accomplish, but I'm not getting it.
>
> What am I doing wrong here?
>
>
> xvals = range(1200)
> yvals = list of temps
>
> self.mainline = self.ax.plot(xvals, yvals, lw=2, color='red')[0]
>
> locator = matplotlib.dates.MinuteLocator()
> self.ax.xaxis.set_major_locator(locator)
> self.ax.xaxis.set_minor_locator(locator)
>
> formatter = matplotlib.dates.DateFormatter('%M:%S')
> self.ax.xaxis.set_major_formatter(formatter)
> self.ax.xaxis.set_minor_formatter(formatter)
>
> # draw the canvas
>
>
> Any help appreciated...thanks!
> BZ
>
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