[Matplotlib-users] Using IndexLocator with DateFormatter

[Richard A. <ral...@in...>]

I am trying to figure out how i can use IndexLocator with DateFormatter.
Currently i am only using DayLocator and HourLocator in my code, but it
is showing ticks for all hours in the plot, when I only care about
plotting the hours for when data is available.

I already applied date2num to my dates in the x list below.



from matplotlib.dates import IndexDateFormatter, DateFormatter, date2num

import matplotlib

from matplotlib import rc

import datetime
from pylab import *


x = [732559.39583333337, 732559.40625, 732559.41666666663,
732559.42708333337,
    732559.4375, 732559.44791666663, 732559.45833333337, 732559.46875, 
    732559.47916666663 , 732559.48958333337, 732559.5,
732559.51041666663, 
    732559.52083333337, 732559.53125, 732559.54166666663,
732559.55208333337,
    732559.5625, 732559.57291666663, 732559.58333333337, 732559.59375, 
    732559.60416666663, 732559.61458333337, 732559.625,
732559.63541666663, 
    732559.64583333337, 732559.65625, 732559.66666666663,
732560.39583333337, 
    732560.40625, 732560.41666666663, 732560.42708333337, 732560.4375, 
    732560.44791666663, 732560.45833333337, 732560.46875,
732560.47916666663, 
    732560.48958333337, 732560.5, 732560.51041666663,
732560.52083333337, 
    732560.53125, 732560.54166666663, 732560.55208333337, 732560.5625, 
    732560.57291666663, 732560.58333333337, 732560.59375,
732560.60416666663, 
    732560.61458333337, 732560.625, 732560.63541666663,
732560.64583333337, 
    732560.65625, 732560.66666666663]
y = [13.07, 13.050000000000001, 13.029999999999999, 13.039999999999999, 
    13.029999999999999, 13.0, 13.0, 13.0, 13.0, 13.029999999999999,
13.02, 
    13.01, 12.99, 12.98, 12.98, 12.960000000000001, 12.94, 12.92, 
    12.960000000000001, 12.98, 13.19, 13.140000000000001,
13.130000000000001, 
    13.109999999999999, 13.08, 13.109999999999999, 13.039999999999999,
13.15, 
    13.130000000000001, 13.15, 13.279999999999999, 13.210000000000001, 
    13.199999999999999, 13.199999999999999, 13.19, 13.199999999999999, 
    13.140000000000001, 13.119999999999999, 13.1, 13.09,
13.130000000000001, 
    13.119999999999999, 13.130000000000001, 13.130000000000001, 
    13.140000000000001, 13.15, 13.16, 13.119999999999999,
13.119999999999999, 
    13.1, 13.050000000000001, 13.029999999999999, 13.02, 13.0]

datesindex = range(len(x))

days = DayLocator()
hours = HourLocator()
ax = subplot(111)
plot(x, y)

ax.xaxis.set_major_locator(days)
ax.xaxis.set_major_formatter(DateFormatter('%Y-%m-%d %H:%M:%S'))
ax.xaxis.set_minor_locator(hours)
ax.xaxis.set_minor_formatter(DateFormatter('%H:%M:%S'))
setp(ax.get_xticklabels(), 'rotation', 90, 'horizontalalignment',
'center', fontsize=8)
minorlabels = [tick.label1 for tick in ax.xaxis.get_minor_ticks()]
setp(minorlabels, 'rotation', 90, 'horizontalalignment', 'center',
fontsize=8)

grid(True)
show()

Any suggestions would be greatly appreciated.

-- 
Rick Albright
Senior Quantitvative Analyst
Indie Research, LLC
254 Witherspoon Street
Princeton, NJ 08542
(609)497-1030
ral...@in...