[Gnuplot-py-users] Difficulty passing time in %m%d%Y format

[Gerald R. <gd...@gm...>]

Hello all, I appreciate the answer to one of the big questions last 
week.  I am now experiencing some other difficulties and I sure could 
use some help. I am attempting to plot a set of sensor readings vs. 
time.  I have a mock set of data, and I will show the error message I 
receive when I run it.  Thank you again for the help!

import Gnuplot
g = Gnuplot.Gnuplot(debug=1)
name = 'Plot.png'
g('set term png')
g('set out "' + name)
g('set key outside')
g('set xdata time')

g('set timefmt "%m/%d/%Y"')
g('set title "Yippy"')
mylist = [ ('06/01/2000',  81.75),
('07/01/2000', 52.125),
('08/01/2000', 50.3125),
('09/01/2000', 61.3125),
('10/01/2000', 26.6875),
('11/01/2000', 19.4375),
('12/01/2000', 17),
('01/01/2001', 14.875),
('02/01/2001', 20.6875),
('03/01/2001', 17.8125),
('04/01/2001', 22.09),
('05/01/2001', 25.41),
('06/01/2001', 20.13),
('07/01/2001', 23.64),
('08/01/2001', 19.01)]
plot = Gnuplot.PlotItems.Data(mylist, with="histeps", title="charlie")
g.plot(plot)

Now the error I receive is:
Traceback (most recent call last):
  File "./graphictest.py", line 27, in <module>
    plot = Gnuplot.PlotItems.Data(mylist, with="histeps", title="charlie")
  File "/usr/lib/python2.5/site-packages/Gnuplot/PlotItems.py", line 
513, in Data
    set = utils.float_array(set[0])
  File "/usr/lib/python2.5/site-packages/Gnuplot/utils.py", line 41, in 
float_array
    return Numeric.asarray(m, Numeric.Float)
  File "/usr/lib/python2.5/site-packages/Numeric/Numeric.py", line 134, 
in asarray
    return multiarray.array(a, typecode, copy=0, savespace=savespace)
TypeError: object of type 'float' has no len()

I have attempted to debugg this myself and have been having no luck.  I 
look at the 'float' has no len() and realize that their is some sort of 
casting error perhaps?  Is it looking at the data points and assuming 
that they are strings? I am baffled.

Thank you again for your help.

Gerald Rude