# [Matplotlib-users] Totaly new to matplotlib

Stevo stm6386 at gmail.com
Fri Feb 5 13:53:56 EST 2016

```Guys,
This is where I am now -
code
def plot_durations(self,starts, stops, ax , **kwargs):
if ax is None:
ax = plt.gca()
# Make the default alignment center, unless specified otherwise
kwargs['align'] = kwargs.get('align', 'center')

# Convert things to matplotlib's internal date format...
starts, stops = mpl.dates.date2num(starts),
mpl.dates.date2num(stops)

# Break things into start days and start times
start_times = starts % 1
start_days = starts - start_times
durations = stops - starts
start_times += int(starts[0]) # So that we have a valid date...

# Plot the bars
artist = ax.bar(start_days, durations, bottom=start_times, **kwargs)

# Tell matplotlib to treat the axes as dates...
hfmt = dates.DateFormatter('%b %d')
ax.xaxis.set_major_formatter(hfmt)
ax.xaxis.set_major_locator(plt.MultipleLocator(1.0)) #a tick mark a
day
ax.yaxis_date()
ax.figure.autofmt_xdate()
ax.invert_yaxis()
plt.subplots_adjust (left = 0.1, bottom = 0.10, right = 0.97, top =
0.97, wspace = 0.20, hspace = 0.2)
plt.show()
code

But for some reason I get inconsistent results for the y axis .....
<http://matplotlib.1069221.n5.nabble.com/file/n46719/figure_1-1.png>
<http://matplotlib.1069221.n5.nabble.com/file/n46719/figure_4.png>
I would prefer just hh:mm format if I could set it but have no idea why it
would the extra 0's ... the script wasnt restarted or anything just another
set of data used, the data looked identical in each case so I have no idea
what the change is caused by .... selecting and reselecting data just gave
the same results.
I could show the whole script if it helps but it gets quite complex.

Just learning and  loving Python
Stevo

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```