matplotlib: TypeError: a float is required

[Andi Clemens]

THATS IT! Thanks!
But why are all the examples wrong? Maybe they changed the API?

Andi

Tim Heaney wrote:
> Andi Clemens <andi.clemens at gmx.net> writes:
>> 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.
> 
> It looks like it doesn't like not having xerr set. The documentation
> says 
> 
>   xerr and yerr, if not None, will be used to generate errorbars on
>   the bar chart
> 
> implying that if they are None (the default), then no errorbars will
> be generated. But that doesn't seem to be the case. When I add an xerr
> to both p1 and p2
> 
>   p1 = bar(ind, menMeans,   width, color='r', yerr=womenStd,
>            xerr=zeros(N))
>   p2 = bar(ind, womenMeans, width, color='y',
>            bottom=menMeans, yerr=menStd, xerr=zeros(N))
> 
> I get the following bar chart
> 
>   http://img176.imageshack.us/my.php?image=imagenx6.png
> 
> with no errors.
> 
> Tim

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