Error with bar charts

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)

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

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:

   > 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)

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

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

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:

   > 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)

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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