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1. cgra commented on Mar 29, 2012

   

   cgra

   on Mar 29, 2012

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   Found with matplotlib 1.1.0, and confirmed by Mike Kaufman on Mar 28 2012 github checkout (see matplotlib-users mailing list, thread view of http://sourceforge.net/mailarchive/message.php?msg_id=29040134).
2. ghost assigned

   mdboom

   on Apr 13, 2012
3. cgra commented on Jun 21, 2012

   

   cgra

   on Jun 21, 2012

   Author

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   Ok, I took a look at the source of the error, class AutoMinorLocator(Locator), in ticker.py, and came up with a very simple fix that involves editing 1 line and adding 2 lines.

   Inside

   class AutoMinorLocator(Locator):

   change the following

           except IndexError:
               raise ValueError('Need at least two major ticks to find minor tick locations')

   to

           except IndexError:
               majorstep = 0

   and change the following

           t0 = majorlocs[0]
           tmin = np.ceil((vmin - t0) / minorstep) * minorstep
           tmax = np.floor((vmax - t0) / minorstep) * minorstep
           locs = np.arange(tmin, tmax, minorstep) + t0
           cond = np.abs((locs - t0) % majorstep) > minorstep/10.0
           locs = locs.compress(cond)
           locs = []

   to

           if len(majorlocs) > 0:
               t0 = majorlocs[0]
               tmin = np.ceil((vmin - t0) / minorstep) * minorstep
               tmax = np.floor((vmax - t0) / minorstep) * minorstep
               locs = np.arange(tmin, tmax, minorstep) + t0
               cond = np.abs((locs - t0) % majorstep) > minorstep/10.0
               locs = locs.compress(cond)
           else:
               locs = []

   The second change could also be done with a try/except instead of an if/else, e.g.

           try:
               t0 = majorlocs[0]
               ...
           except IndexError:
               locs = []

   Then when there are less than 2 major ticks visible on an axis, the minor ticks are not shown at all. (When zooming back out, the minor ticks are shown again.) This seems to be the best solution, since there does not seem to be an axis property to get tick locations that are outside the plot view range.

   How does one go about submitting this to the matplotlib package?
4. WeatherGod

   added a commit that references this issue on Jun 22, 2012

   Implements @cgra (Christopher Graves) suggestion for issue matplotlib…

   a6a9624
5. cgra

   closed this as completedon Aug 6, 2012