Hi!
Below is a sample program. It demonstrates two bugs when plotting date/
time histograms.
1. When the y scale is made "log", the histogram points plot as
lines, but when the y scale is not log, they histogram plots as bars.
I do not think that the look of the bars should change depending on
whether or not the Y scale is logarithmic.
2. When the "agg.pdf" is removed, specifying "log" for the yscale
produces a TypeError on the mac (see below)
I would really like to know how to plot a histogram with real
bars ,rather than little lines.
Thanks!
import matplotlib
matplotlib.use('agg.pdf')
if __name__=="__main__":
import datetime
import numpy as np
import matplotlib
import matplotlib.pyplot as pyplot
import matplotlib.dates as mdates
import matplotlib.mlab as mlab
dates_and_counts = [[datetime.datetime(90,i,1), i*10] for i in
range(1,13)]
dates, counts = zip(*dates_and_counts)
years = mdates.YearLocator() # every year
months = mdates.MonthLocator() # every month
yearsFmt = mdates.DateFormatter('%Y')
fig = pyplot.figure()
ax = fig.add_subplot(111)
ax.bar(dates,counts)
ax.set_ylabel('file count')
ax.set_xlabel('file modification time (mtime)')
ax.set_yscale('log')
ax.xaxis.set_major_locator(years)
ax.xaxis.set_major_formatter(yearsFmt)
datemin = datetime.date(min(dates).year, 1, 1)
datemax = datetime.date(max(dates).year, 1, 1)
ax.set_xlim(datemin, datemax)
ax.set_ylim(0,max(counts))
# format the coords message box
def price(x): return '$%1.2f'%x
ax.format_xdata = mdates.DateFormatter('%Y-%m-%d')
ax.format_ydata = price
ax.grid(True)
# rotates and right aligns the x labels, and moves the bottom of the
# axes up to make room for them
fig.autofmt_xdate()
pyplot.savefig("hist.pdf",format='pdf')
12:12 PM m:~$ python f.py
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/site-packages/matplotlib/figure.py", line 772, in draw
for a in self.axes: a.draw(renderer)
File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/site-packages/matplotlib/axes.py", line 1601, in draw
a.draw(renderer)
File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/site-packages/matplotlib/axis.py", line 710, in draw
tick.draw(renderer)
File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/site-packages/matplotlib/axis.py", line 193, in draw
self.label1.draw(renderer)
File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/site-packages/matplotlib/text.py", line 502, in draw
ismath=ismath)
File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/site-packages/matplotlib/backends/backend_macosx.py", line
120, in draw_text
self._draw_mathtext(gc, x, y, s, prop, angle)
File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/site-packages/matplotlib/backends/backend_macosx.py", line
112, in _draw_mathtext
gc.draw_mathtext(x, y, angle, 255 - image.as_array())
TypeError: image has incorrect type (should be uint8)
12:12 PM m:~$ %
V/r,
Simson Garfinkel
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