>>>>> "Johannes" == Johannes Elbs <[EMAIL PROTECTED]> writes:
Johannes> Hi, I have time data stored in the format hh:mm:ss and
Johannes> would like to plot it, having about 4 to 6 ticks labeled
Johannes> in this format. What I'm doing at the moment is to
Johannes> first convert my time to seconds and plot y as function
Johannes> of yime in seconds.
You first need to convert them to matplotlib dates. Assume your data
are collected on Oct 10th, 2006
import matplotlib.numerix as nx
import datetime
from matplotlib.dates import date2num, MINUTES_PER_DAY, SEC_PER_DAY
d0 = date2num(datetime.date(2006,10,10))
def convert(s):
h,m,s = map(float, s.split(':'))
return d0 + h/24. + m/MINUTES_PER_DAY + s/SEC_PER_DAY
In [11]: convert('12:32:02')
Out[11]: 732594.52224537032
matplotlib represents dates as days (float) since 0000-00-00
Now you need to convert your list of strings to mpl dates. If your
list of strings is called datestrs
dates = nx.array([convert(s) for s in datestrs])
Now when you plot you need to tell mpl you are plotting dates
ax.plot_date(dates, vals)
We have pretty smart tick locators and tick formatters for date
plotting, so you may be happy with what you get, but if not you can
set your own
from matplotlib.dates import DateFormatter
ax.xaxis.set_major_formatter('%H:%M:%S')
I also find it helpful on date plots to do the following
# move the subplot up a bit to make for rotated labels
fig.subplots_adjust(bottom=0.15)
for label in ax.get_xticklabels():
label.set_rotation(30)
label.set_horizontalalignment('right')
see also
http://matplotlib.sf.net/matplotlib.dates.html
http://matplotlib.sf.net/matplotlib.ticker.html
the users guide and the following examples
date_demo1.py
date_demo2.py
date_demo_convert.py
date_demo_rrule.py
finance_demo.py
JDH
-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
