Thread: [Matplotlib-users] 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/
> 
> 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 <jf...@gm...>:
>
> 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

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 <jf...@gm...>:
>>
>> 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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