Re: [Matplotlib-users] Using plot_date correctly

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

>>>>> "James" == James Boyle <bo...@ll...> writes:

    James> I have been trying to use the plot_date of matplotlib
    James> (0.6.2.4) with limited success.  Apparently, I must have
    James> some basic misconception as to what is going on.  What I am
    James> try to do is plot data that has values every 6 hours with
    James> major ticks at each day and minor every 12 hours.  Attached
    James> is my latest attempt. The basic problem is that the major
    James> and minor ticks do not line up.

    James> Thanks for any help. code and plot are below

Hi Jim,

You are using the constructor of DayLocator incorrectly.  There are
two day tickers.  It's a bit confusing because the constructor of
DayLocator takes an hour on which to place the tick, and
DayMultiLocator takes an integer base and ticks days which are
multiples of that base

  * DayLocator     - locate a given hour each day
  
  * DayMultiLocator - Make ticks on day which are multiples of base

When you say DayLocator(1), you are placing a tick every day *at 1am*.
If you say DayLocator(5), the tick is at 5am.  You want the default
constructor DayLocator(), which places the tick at hour=0, midnight.

Nice file name, by the way :-)
JDH