matplotlib-users

[Matplotlib-users] Error with bar charts

[<sto...@ya...>]

I receive an error when trying to plot barcharts.  To confirm it was 
nothing to do with my code, I tried running one of the demos provided and 
received the same error:

$ python barchart_demo.py
Traceback (most recent call last):
   File "barchart_demo.py", line 11, in ?
     p1 = bar(ind, menMeans, width, color='r', yerr=menStd)
   File "/usr/lib64/python2.4/site-packages/matplotlib/pylab.py", line 
1641, in bar
     ret =  gca().bar(*args, **kwargs)
   File "/usr/lib64/python2.4/site-packages/matplotlib/axes.py", line 2485, 
in bar
     xerr = asarray([xerr]*nbars, Float)
   File "/usr/lib64/python2.4/site-packages/numarray/numarraycore.py", line 
434, in asarray
     return array(seq, type=type, typecode=typecode, copy=0, dtype=dtype)
   File "/usr/lib64/python2.4/site-packages/numarray/numarraycore.py", line 
417, in array
     return fromlist(sequence,type,shape)
   File "/usr/lib64/python2.4/site-packages/numarray/numarraycore.py", line 
267, in fromlist
     arr.fromlist(seq)
ValueError: Invalid sequence.

Can't figure out the issue in numarray it is encountering.

I am brand spanking new to matplotlib and using python for scientific 
computing (amazing product; can't believe I didn't know about it before.) 
and would appreciate some help in getting started.  I apologise if it's 
something basic (couldn't find anything on google).

python 2.4.3
matplotlib 0.87.4
numarray-1.5.2
(Mandriva 2007 x64-64)

Thanks,
Suresh

Re: [Matplotlib-users] Error with bar charts

[John H. <jdh...@ac...>]

>>>>> "stochashtic" == stochashtic  <sto...@ya...> writes:

    stochashtic> I am brand spanking new to matplotlib and using
    stochashtic> python for scientific computing (amazing product;
    stochashtic> can't believe I didn't know about it before.)  and
    stochashtic> would appreciate some help in getting started.  I
    stochashtic> apologise if it's something basic (couldn't find
    stochashtic> anything on google).

    stochashtic> python 2.4.3 matplotlib 0.87.4 numarray-1.5.2
    stochashtic> (Mandriva 2007 x64-64)

If you are using numarray, make sure your numerix setting in
matplotlibrc is 

numerix : numarray

See http://matplotlib.sf.net/matplotlibrc

You can check your numerix setting by passing the --verbose-helpful
flag at the command line.  You can also force numarray by passing
--numarray.

Eg

> python myscript.py --verbose-helpful --numarray

if this doesn't work, please post a complete example

JDH

Re: [Matplotlib-users] Error with bar charts

[Suresh P. <sto...@ya...>]

The exception I posted is being thrown by numarray, so it is definitely 
being used.

As I stated, it was thrown while executing one of the examples provided 
with the matplotlib package:

#!/usr/bin/env python
# barchart_demo.py
# a bar plot with errorbars
from pylab import *

N = 5
menMeans = (20, 35, 30, 35, 27)
menStd =   (2, 3, 4, 1, 2)

ind = arange(N)  # the x locations for the groups
width = 0.35       # the width of the bars
p1 = bar(ind, menMeans, width, color='r', yerr=menStd)

womenMeans = (25, 32, 34, 20, 25)
womenStd =   (3, 5, 2, 3, 3)
p2 = bar(ind+width, womenMeans, width, color='y', yerr=womenStd)

ylabel('Scores')
title('Scores by group and gender')
xticks(ind+width, ('G1', 'G2', 'G3', 'G4', 'G5') )

legend( (p1[0], p2[0]), ('Men', 'Women') )

#savefig('barchart_demo')
show()

Thanks,
Suresh

On Thu, 26 Oct 2006, JDH wrote:

>>>>>> "stochashtic" == stochashtic  <sto...@ya...> writes:
>
>    stochashtic> I am brand spanking new to matplotlib and using
>    stochashtic> python for scientific computing (amazing product;
>    stochashtic> can't believe I didn't know about it before.)  and
>    stochashtic> would appreciate some help in getting started.  I
>    stochashtic> apologise if it's something basic (couldn't find
>    stochashtic> anything on google).
>
>    stochashtic> python 2.4.3 matplotlib 0.87.4 numarray-1.5.2
>    stochashtic> (Mandriva 2007 x64-64)
>
> If you are using numarray, make sure your numerix setting in
> matplotlibrc is
>
> numerix : numarray
>
> See http://matplotlib.sf.net/matplotlibrc
>
> You can check your numerix setting by passing the --verbose-helpful
> flag at the command line.  You can also force numarray by passing
> --numarray.
>
> Eg
>
>> python myscript.py --verbose-helpful --numarray
>
> if this doesn't work, please post a complete example
>
> JDH
>

Re: [Matplotlib-users] Error with bar charts

[Suresh P. <sto...@ya...>]

And yes my numerix is set to numarray as default:

$ python barchart_demo.py --verbose-helpful
...
numerix numarray 1.5.2
...

Thanks,
Suresh



On Thu, 26 Oct 2006, Suresh Pillai wrote:

> The exception I posted is being thrown by numarray, so it is definitely
> being used.
>
> As I stated, it was thrown while executing one of the examples provided
> with the matplotlib package:
>
> #!/usr/bin/env python
> # barchart_demo.py
> # a bar plot with errorbars
> from pylab import *
>
> N = 5
> menMeans = (20, 35, 30, 35, 27)
> menStd =   (2, 3, 4, 1, 2)
>
> ind = arange(N)  # the x locations for the groups
> width = 0.35       # the width of the bars
> p1 = bar(ind, menMeans, width, color='r', yerr=menStd)
>
> womenMeans = (25, 32, 34, 20, 25)
> womenStd =   (3, 5, 2, 3, 3)
> p2 = bar(ind+width, womenMeans, width, color='y', yerr=womenStd)
>
> ylabel('Scores')
> title('Scores by group and gender')
> xticks(ind+width, ('G1', 'G2', 'G3', 'G4', 'G5') )
>
> legend( (p1[0], p2[0]), ('Men', 'Women') )
>
> #savefig('barchart_demo')
> show()
>
> Thanks,
> Suresh
>

Re: [Matplotlib-users] Error with bar charts

[Martin S. <sc...@ms...>]

Suresh,

That example works fine for me, using python 2.4.3, mpl 0.87.5 under 
windows, and wxPython 2.6.3.3, with backend: WxAgg, numerix: numarray 
(1.5.1), interactive: False, and axes.hold: True in the RC file.

I'd recommend going with numpy instead of numarray, if you can. See 
http://numeric.numpy.org/ and http://scipy.org.

Martin

Suresh Pillai wrote:
> The exception I posted is being thrown by numarray, so it is definitely 
> being used.
> 
> As I stated, it was thrown while executing one of the examples provided 
> with the matplotlib package:
> 
> #!/usr/bin/env python
> # barchart_demo.py
> # a bar plot with errorbars
> from pylab import *
> 
> N = 5
> menMeans = (20, 35, 30, 35, 27)
> menStd =   (2, 3, 4, 1, 2)
> 
> ind = arange(N)  # the x locations for the groups
> width = 0.35       # the width of the bars
> p1 = bar(ind, menMeans, width, color='r', yerr=menStd)
> 
> womenMeans = (25, 32, 34, 20, 25)
> womenStd =   (3, 5, 2, 3, 3)
> p2 = bar(ind+width, womenMeans, width, color='y', yerr=womenStd)
> 
> ylabel('Scores')
> title('Scores by group and gender')
> xticks(ind+width, ('G1', 'G2', 'G3', 'G4', 'G5') )
> 
> legend( (p1[0], p2[0]), ('Men', 'Women') )
> 
> #savefig('barchart_demo')
> show()
> 
> Thanks,
> Suresh
> 
> On Thu, 26 Oct 2006, JDH wrote:
> 
>>>>>>> "stochashtic" == stochashtic  <sto...@ya...> writes:
>>    stochashtic> I am brand spanking new to matplotlib and using
>>    stochashtic> python for scientific computing (amazing product;
>>    stochashtic> can't believe I didn't know about it before.)  and
>>    stochashtic> would appreciate some help in getting started.  I
>>    stochashtic> apologise if it's something basic (couldn't find
>>    stochashtic> anything on google).
>>
>>    stochashtic> python 2.4.3 matplotlib 0.87.4 numarray-1.5.2
>>    stochashtic> (Mandriva 2007 x64-64)
>>
>> If you are using numarray, make sure your numerix setting in
>> matplotlibrc is
>>
>> numerix : numarray
>>
>> See http://matplotlib.sf.net/matplotlibrc
>>
>> You can check your numerix setting by passing the --verbose-helpful
>> flag at the command line.  You can also force numarray by passing
>> --numarray.
>>
>> Eg
>>
>>> python myscript.py --verbose-helpful --numarray
>> if this doesn't work, please post a complete example
>>
>> JDH
>>
> 
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Re: [Matplotlib-users] Error with bar charts

[Eric F. <ef...@ha...>]

Suresh,

This is baffling, and particularly annoying for someone just starting 
out with mpl.  I don't think there is any problem with the barchart 
code--the demo works for me with numarray--and I don't see anything 
obvious in the traceback. Are your matplotlib and numarray both from 
Mandriva packages?

I would be inclined to download numpy and matplotlib as nice, fresh 
tarballs, uninstall any previous versions (including numarray), build 
and install numpy, and then do the same for matplotlib.  If you have not 
done this before you will probably trip over some missing -devel 
packages (furnishing header files for python, gtk, etc), but once all 
that is straightened out it should go smoothly.

Eric

sto...@ya... wrote:
> I receive an error when trying to plot barcharts.  To confirm it was 
> nothing to do with my code, I tried running one of the demos provided and 
> received the same error:
> 
> $ python barchart_demo.py
> Traceback (most recent call last):
>    File "barchart_demo.py", line 11, in ?
>      p1 = bar(ind, menMeans, width, color='r', yerr=menStd)
>    File "/usr/lib64/python2.4/site-packages/matplotlib/pylab.py", line 
> 1641, in bar
>      ret =  gca().bar(*args, **kwargs)
>    File "/usr/lib64/python2.4/site-packages/matplotlib/axes.py", line 2485, 
> in bar
>      xerr = asarray([xerr]*nbars, Float)
>    File "/usr/lib64/python2.4/site-packages/numarray/numarraycore.py", line 
> 434, in asarray
>      return array(seq, type=type, typecode=typecode, copy=0, dtype=dtype)
>    File "/usr/lib64/python2.4/site-packages/numarray/numarraycore.py", line 
> 417, in array
>      return fromlist(sequence,type,shape)
>    File "/usr/lib64/python2.4/site-packages/numarray/numarraycore.py", line 
> 267, in fromlist
>      arr.fromlist(seq)
> ValueError: Invalid sequence.
> 
> Can't figure out the issue in numarray it is encountering.
> 
> I am brand spanking new to matplotlib and using python for scientific 
> computing (amazing product; can't believe I didn't know about it before.) 
> and would appreciate some help in getting started.  I apologise if it's 
> something basic (couldn't find anything on google).
> 
> python 2.4.3
> matplotlib 0.87.4
> numarray-1.5.2
> (Mandriva 2007 x64-64)
> 
> Thanks,
> Suresh
> 
> -------------------------------------------------------------------------
> 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
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Re: [Matplotlib-users] Error with bar charts

[Suresh P. <sto...@ya...>]

Yes, both are mandriva packages:

python-matplotlib-0.87.4-2mdv2007.0
python-numarray-1.5.2-1mdv2007.0

Given there isnt a python-numpy package for x64-64 right now (there is a 
devel one, so not sure why no main package), I will go ahead and try to 
build from scratch.

Thanks,
Suresh



On Thu, 26 Oct 2006, Eric Firing wrote:

> Suresh,
>
> This is baffling, and particularly annoying for someone just starting out 
> with mpl.  I don't think there is any problem with the barchart code--the 
> demo works for me with numarray--and I don't see anything obvious in the 
> traceback. Are your matplotlib and numarray both from Mandriva packages?
>
> I would be inclined to download numpy and matplotlib as nice, fresh tarballs, 
> uninstall any previous versions (including numarray), build and install 
> numpy, and then do the same for matplotlib.  If you have not done this before 
> you will probably trip over some missing -devel packages (furnishing header 
> files for python, gtk, etc), but once all that is straightened out it should 
> go smoothly.
>
> Eric
>

Re: [Matplotlib-users] Error with bar charts

[Suresh P. <sto...@ya...>]

Thanks for the support.

I uninstalled numarray, and then compiled/installed most recent numpy and 
matplotlib from the tarballs.

And I am happy to announce I can now perform the mundane task of plotting 
barcharts and histograms. :)

Thanks again everyone,
Suresh

On Thu, 26 Oct 2006, Eric Firing wrote:

> Suresh,
>
> This is baffling, and particularly annoying for someone just starting out 
> with mpl.  I don't think there is any problem with the barchart code--the 
> demo works for me with numarray--and I don't see anything obvious in the 
> traceback. Are your matplotlib and numarray both from Mandriva packages?
>
> I would be inclined to download numpy and matplotlib as nice, fresh tarballs, 
> uninstall any previous versions (including numarray), build and install 
> numpy, and then do the same for matplotlib.  If you have not done this before 
> you will probably trip over some missing -devel packages (furnishing header 
> files for python, gtk, etc), but once all that is straightened out it should 
> go smoothly.
>
> Eric