Date format the x-axis of a barh() plot?

Hello,

I'm trying to create a bar chart that looks something like a gannt chart...

See the simple example here:

http://www.promana.net/making-use-of-gantt-charts/

I'm trying to utilize barh() and fmt_xdata to accomplish this with the
following:

···

#~~~~~~~~~~~~~~~~~~~~~~~

date1 = datetime.datetime( 2000, 3, 2)
date2 = datetime.datetime( 2000, 3, 6)
delta = datetime.timedelta(hours=6)
dates = mdates.drange(date1, date2, delta)

val = mdates.drange(date1,date2,delta) # the bar lengths
pos = range(len(val)) # the bar centers on the y axis
height=0.5 # the bar height
left=mdates.drange(date1,date2,delta) # the bar starting position

fig = plt.figure()
ax = fig.add_subplot(111)
ax.barh(pos,val,height=height,left=left,align='center',alpha=0.3)
ax.fmt_xdata = mdates.DateFormatter('%Y-%m-%d %H:%M:%S')

#~~~~~~~~~~~~~~~~~~~~~~~

Even with ax.fmt_xdata, I'm simply getting numbers on the x-axis instead of
dates. Can anyone offer some pointers?

Thanks,
James

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Hello,

don’t know the foo behind it, but using

ax.xaxis.set_major_formatter(mdates.DateFormatter(’%Y-%m-%d %H:%M:%S’))

works.

Regards,

Sebastian

···

On Sun, 2011-04-17 at 19:52 -0700, jfortiv wrote:


Hello, I'm trying to create a bar chart that looks something like a gannt chart...
See the simple example here:
[http://www.promana.net/making-use-of-gantt-charts/](http://www.promana.net/making-use-of-gantt-charts/)

I'm trying to utilize barh() and fmt_xdata to accomplish this with the
following:
#~~~~~~~~~~~~~~~~~~~~~~~
date1 = datetime.datetime( 2000, 3, 2)
date2 = datetime.datetime( 2000, 3, 6)
delta = datetime.timedelta(hours=6)
dates = mdates.drange(date1, date2, delta)
val = mdates.drange(date1,date2,delta) # the bar lengths
pos = range(len(val)) # the bar centers on the y axis
height=0.5 # the bar height
left=mdates.drange(date1,date2,delta) # the bar starting position
fig = plt.figure()
ax = fig.add_subplot(111)
ax.barh(pos,val,height=height,left=left,align='center',alpha=0.3)
ax.fmt_xdata = mdates.DateFormatter('%Y-%m-%d %H:%M:%S')
#~~~~~~~~~~~~~~~~~~~~~~~
Even with ax.fmt_xdata, I'm simply getting numbers on the x-axis instead of
dates. Can anyone offer some pointers?
Thanks,
James

Hi,

This actually did not work for me. Can you show me the full code that you
used to successfully produce the time-format x-axis labels?

Thanks,
James

Sebastian Berg wrote:

···

Hello,

don't know the foo behind it, but using
ax.xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m-%d %H:%M:%S'))
works.

Regards,

Sebastian

On Sun, 2011-04-17 at 19:52 -0700, jfortiv wrote:

Hello,

I'm trying to create a bar chart that looks something like a gannt
chart...

See the simple example here:

http://www.promana.net/making-use-of-gantt-charts/

I'm trying to utilize barh() and fmt_xdata to accomplish this with the
following:

#~~~~~~~~~~~~~~~~~~~~~~~

date1 = datetime.datetime( 2000, 3, 2)
date2 = datetime.datetime( 2000, 3, 6)
delta = datetime.timedelta(hours=6)
dates = mdates.drange(date1, date2, delta)

val = mdates.drange(date1,date2,delta) # the bar lengths
pos = range(len(val)) # the bar centers on the y axis
height=0.5 # the bar height
left=mdates.drange(date1,date2,delta) # the bar starting position

fig = plt.figure()
ax = fig.add_subplot(111)
ax.barh(pos,val,height=height,left=left,align='center',alpha=0.3)
ax.fmt_xdata = mdates.DateFormatter('%Y-%m-%d %H:%M:%S')

#~~~~~~~~~~~~~~~~~~~~~~~

Even with ax.fmt_xdata, I'm simply getting numbers on the x-axis instead
of
dates. Can anyone offer some pointers?

Thanks,
James

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2011/4/23 jfortiv <jfortiv@...287...>:

Hi,

This actually did not work for me. Can you show me the full code that you
used to successfully produce the time-format x-axis labels?

See attached files.

Goyo

sample.py (717 Bytes)

sample.png

This worked. Thank you very much! For some reason I had commented out
ax.fmt_xdata = ...

This is exactly what I needed.

James

Goyo wrote:

···

2011/4/23 jfortiv <jfortiv@...287...>:

Hi,

This actually did not work for me. Can you show me the full code that
you
used to successfully produce the time-format x-axis labels?

See attached files.

Goyo

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