matplotlib-users

[Matplotlib-users] Help with Tick Locators and Formatters

[Jessika C. <eli...@ya...>]

I've been trying in vain to get the correct format for
the y-axis.  I am doing an intraday financial chart
and would like to label the ticks every 5 minutes.  I
am following the example located @
http://matplotlib.sourceforge.net/screenshots/finance_work2.py
Data gets loaded from the CSV file just like in the
example.

I have something along these lines:

hours = HourLocator()
minutes = MinuteLocator()
timeFmt = DateFormatter('%H:%M')

ax.xaxis.set_major_locator(hours)
ax.xaxis.set_minor_locator(minutes)
ax.xaxis.set_minor_formatter(timeFmt)

ax.autoscale_view()

Am I too far off target here?  Because I can't get it
to work.

I've also looked at the user's manual (5.4 example 2:
date ticking).  Could someone please point me in the
right direction or provide an example of how it
_should_ be done?  Thank you in advance.


		
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Re: [Matplotlib-users] Help with Tick Locators and Formatters

[John H. <jdh...@ac...>]

>>>>> "Jessika" == Jessika Chumak <eli...@ya...> writes:

    Jessika> hours = HourLocator() minutes = MinuteLocator() timeFmt =
    Jessika> DateFormatter('%H:%M')

    Jessika> ax.xaxis.set_major_locator(hours)
    Jessika> ax.xaxis.set_minor_locator(minutes)
    Jessika> ax.xaxis.set_minor_formatter(timeFmt)

    Jessika> ax.autoscale_view()

    Jessika> Am I too far off target here?  Because I can't get it to
    Jessika> work.

    Jessika> I've also looked at the user's manual (5.4 example 2:
    Jessika> date ticking).  Could someone please point me in the
    Jessika> right direction or provide an example of how it _should_
    Jessika> be done?  Thank you in advance.

All of the date ticker locators accept ranges to indicate where you
want the ticks.  See, eg,
http://matplotlib.sourceforge.net/matplotlib.dates.html#MinuteLocator

To tick every 5 minutes, just give the range of minutes you want
ticked

  loc = MinuteLocator(range(5,60,5))  # don't tick on 0 and 60
  loc = MinuteLocator(range(0,61,5))  # tick on 0 and 60 as well

The default is to tick on every minute...

JDH