matplotlib-users Mailing List for matplotlib

It seems that this is not possible with bar or barh.
I guess the best way is to use a separate errorbar comannd
import matplotlib.pyplot as plt
import numpy as np
val = 3+10*np.random.rand(5) # the bar lengths
pos = np.arange(5)+.5 # the bar centers on the y axis
yerr = np.random.rand(5)
plt.figure(2)
plt.bar(pos,val, align='center')
erb = plt.errorbar(pos, val, yerr=[np.zeros(len(yerr)), yerr], fmt=None)
erb[1][0].set_visible(False) # make lower error cap invisible
plt.xticks(pos, ('Tom', 'Dick', 'Harry', 'Slim', 'Jim'))
plt.show()
-JJ
On Sun, Oct 18, 2009 at 7:19 AM, Christian Meesters
<mee...@im...> wrote:
> Hi,
>
> Is there a way to have errorbars in a bar plot going in just one
> direction? E. g. like that
>
>  -
>  |
> +-----+
> |   |
>
> instead of
>
>  -
>  |
> +-----+
> | | |
>  -
>
> ?
>
> TIA
> Christian
>
>
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Hi,
I found a small bug in matplotlib.axes.Axes.add_artist method. 
matplotlib.artist.Artist.set_axes method is called twice.
def add_artist(self, a):
 '''
 Add any :class:`~matplotlib.artist.Artist` to the axes.
 Returns the artist.
 '''
 * a.set_axes(self) *
 self.artists.append(a)
 self._set_artist_props(a)
 a.set_clip_path(self.patch)
 a._remove_method = lambda h: self.artists.remove(h)
 return a
def _set_artist_props(self, a):
 'set the boilerplate props for artists added to axes'
 a.set_figure(self.figure)
 if not a.is_transform_set():
 a.set_transform(self.transData)
 * a.set_axes(self) *
matplotlib version: 0.99.1.1
Regards,
Yann

Thank you very much !!
With python 2.6... There is no error, no crash...
Michael Droettboom a écrit :
> I don't think maxdict is the problem though it may be changing how the 
> problem manifests itself. What is happening is that when maxdict is 
> used, those C++ extension objects are deleted after the first 50 math 
> expressions. When using a dict, they aren't deleted until closing the 
> application, so it just delays the problem.
>
> All that said, I'm not sure as to the real cause of the error.
>
> I was able to reproduce it on Windows XP with:
>
> mpl 0.98.5, wx 2.8.10.6, python 2.5.4
>
> however, the following seems to work:
>
> mpl 0.98.5, wx 2.8.10.6, python 2.6.3
>
> Are you able to update to Python 2.6? That might be one solution to 
> the problem.
>
> I have to say I'm completely stumped as to the root cause of this one.
>
> Mike
>
> On 10/17/2009 08:44 AM, Cédrick FAURY wrote:
>> Hello,
>>
>> I restate the problem :
>>
>> With the attached script "test_mathtext_wx.py" :
>> 50 functions (line 31) : the 50 bitmaps are generated correctly, by 
>> when I close the application an error appears in the console :
>>
>> Assertion failed: ob_refcnt == 0, file CXX\cxx_extensions.cxx, line 1128
>> This application has requested the Runtime to terminate it in an 
>> unusual way.
>> Please contact the application's support team for more information.
>>
>> 250 functions : the window never appears and the crash occurs (same 
>> message)
>>
>>
>> However, if in mathtext.py (mpl 0.98.5 win32 py2.5) line 2765 in 
>> MathTextParser, I put "self._cache = dict()" instead of "self._cache 
>> = maxdict(50)", the behavior of "test_mathtext_wx.py" is 
>> significantly different.
>> 50 functions : error on console after closing the application (no 
>> difference here)
>> 250 functions : NO CRASH (but error after closing the application)
>>
>> And now, my questions :
>> Is this proof that "maxdict" is the cause of the problem ?
>> Is there a known way to avoid the problem?
>> Can someone tell me more about maxdict ?
>>
>> Hoping to have been quite clear,
>> Cédrick
>>
>>
>>
>
>

Hi,
Is this a common problem when installing matplotlib on Mac OS?
The matplotlib (OS X/.dmg) installer provides this error msg:
You cannot install matplotlib 0.99.1.1-r7813 on this volume. matplotlib
requires System Python 2.6 to install.
##
Yet it appears I have the correct Python available on OS X 10.5.8:
$ whereis python
/usr/bin/python
$ python
Python 2.6.3 (r263:75183, Oct 4 2009, 16:48:48)
[GCC 4.0.1 (Apple Inc. build 5484)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>
##
Thank you for any advice.
Seeking a popular method to install all the bits...
Cheers,
DK

hi all,
i would like to draw points on the 3-d simplex, like that of a
dirichlet distribution with 3 parameters. in other words, all i want
to draw are three axes that go from 0 to 1 and make a triangular
shape, such that each point on the triangular region the three axes
form uniquely determines a point on the simplex.
is there an easy way to do this in matplotlib? just to be clear, i
dont want to draw a density/distribution over the simplex, but just
individual points on it. so really all i want are three ordinary axes
that happen to intersect and make a triangle.
thanks very much.