matplotlib: TypeError: a float is required

[Andi Clemens]

btw, these are the versions I'm using (Archlinux):

Python: 2.4.3 (python-2.4.3-3)
matplotlib: 0.87.4 (python-matplotlib-0.87.4-1)
PyGTK: 2.8.6 (pygtk-2.8.6-3)

Andi


Andi Clemens wrote:
> Hi,
> 
> everytime I try to plot a bar with matplotlib I get the following error 
> message:
> Traceback (most recent call last):
>   File "bar_stacked.py", line 13, in ?
>     p1 = bar(ind, menMeans,   width, color='r', yerr=womenStd)
>   File "/usr/lib/python2.4/site-packages/matplotlib/pylab.py", line 
> 1641, in bar
>     ret =  gca().bar(*args, **kwargs)
>   File "/usr/lib/python2.4/site-packages/matplotlib/axes.py", line 2485, 
> in bar
>     xerr = asarray([xerr]*nbars, Float)
>   File "/usr/lib/python2.4/site-packages/Numeric/Numeric.py", line 134, 
> in asarray
>     return multiarray.array(a, typecode, copy=0, savespace=savespace)
> TypeError: a float is required
> 
> 
> So I guess it has something to do with Numeric.py, but I can't figure 
> out what the problem is. I tried to google but found nothing...
> 
> Anyone has the same problem? I can plot all kinds of graphics with 
> matplotlib, but the only type I'm interested in (bars) will not work.
> 
> I tried the examples coming with matplotlib, but even those don't work.
> 
> Here is the example code which produces the above error:
> #!/usr/bin/env python
> # a stacked bar plot with errorbars
> from pylab import *
> 
> N = 5
> menMeans   = (20, 35, 30, 35, 27)
> womenMeans = (25, 32, 34, 20, 25)
> menStd     = (2, 3, 4, 1, 2)
> womenStd   = (3, 5, 2, 3, 3)
> ind = arange(N)    # the x locations for the groups
> width = 0.35       # the width of the bars: can also be len(x) sequence
> 
> p1 = bar(ind, menMeans,   width, color='r', yerr=womenStd)
> p2 = bar(ind, womenMeans, width, color='y',
>          bottom=menMeans, yerr=menStd)
> 
> ylabel('Scores')
> title('Scores by group and gender')
> xticks(ind+width/2., ('G1', 'G2', 'G3', 'G4', 'G5') )
> yticks(arange(0,81,10))
> legend( (p1[0], p2[0]), ('Men', 'Women') )
> 
> show()
> 
> 
> Anyone has matplotlib installed and gets the same error?
> I need to create some charts for a project I do at work, so maybe there 
> are other modules out there creating charts??
> 
> Andi
> 

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