I'm having an unusually hard time with plotting some data on a date axis.
All I want to do is plot several data series over a specific 8 week period. It
works fine when I plot all the data (that is not specifying a date range) but
when I try to use the axis command to put in my limits it puts the scales up
nicely but no data points appear and moreover then I reload and run it again it
goes into an infinite loop. I've tried it with Matplotlib 0.90.1 and 0.98.1
with the same results.
The plot() method below:
class Plotter:
"""Generate plots of disk trend data
"""
Marker = ['s','o','^','d','v','p','x','+','h','<','>','1']
Color = ['black','red','blue','green','aqua','fuchsia',
'navy','purple','olive','maroon','gray','teal']
def __init__(self, trenddict):
self.trenddict = trenddict
self.today = datetime.date.today()
self.dates = trenddict.keys() #keys are datetime objects
self.dates.sort() #sorted list of datetime objects
def extract(self, dirlist):
x = []
ys = {}
for date in self.dates:
x.append(date2num(date))
for dirname in dirlist:
value = self.trenddict[date][dirname]
try:
ys[dirname].append(value)
except KeyError:
ys[dirname] = [value]
return x, ys
def plot(self, dirlist, title, scalemax, filename):
fig = figure(num=1, figsize=(8,10), frameon=False)
ax = fig.add_subplot(111)
ax.set_title(title)
ax.xaxis.set_major_locator(WeekdayLocator(MONDAY))
ax.xaxis.set_minor_locator(MultipleLocator(1))
ax.yaxis.set_major_locator(MultipleLocator(10))
ax.set_ylabel("GBytes")
ax.grid(True)
start = date2num(self.today - datetime.timedelta(49))
end = date2num(self.today + datetime.timedelta(7))
#fig.autofmt_xdate()
ax.axis([start, end, 0, scalemax])
x, ys = self.extract(dirlist)
for i, directory in enumerate(dirlist):
plot_date(x, ys[directory],
linestyle='-',
marker=self.Marker[i],
color=self.Color[i],
label=directory)
tl = ax.get_xticklabels()
setp(tl, 'rotation', 45, fontsize=10)
legend(loc='lower left', prop=FontProperties(size="smaller"))
savefig(filename)
show()
close()
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