The problem seems to originate from this line in lib/matplotlib/sankey.py:
patch = PathPatch(Path(vertices, codes),
fc=kwargs.pop('fc', kwargs.pop('facecolor',
'#bfd1d4')), # Custom defaults
lw=kwargs.pop('lw', kwargs.pop('linewidth',
'0.5')),
**kwargs)
Note that the linewidth is set to the string '0.5' rather than the float 0.5.
gc.set_linewidth is then called with the string '0.5' as the argument, which
triggers the error. If I replace '0.5' by 0.5, the example runs fine with the
MacOSX backend.
Is there a reason why this needs to be a string here? I would think that in
general gc.set_linewidth should only accept floats and ints.
-Michiel.
--- On Fri, 1/6/12, Mingkui Li <ken.mk...@gmail.com> wrote:
From: Mingkui Li <ken.mk...@gmail.com>
Subject: [Matplotlib-users] matplotlib 1.1 "TypeError: a float is required"
problem
To: matplotlib-users@lists.sourceforge.net
Date: Friday, January 6, 2012, 10:54 AM
I just updated matplotlib to 1.1 and want try the new features
Sankey Diagrams
and
Animation
but when I try the api example code: sankey_demo_basics.py
I got the error messages as
below:==============================================================================Traceback
(most recent call last): File
"/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs) File
"/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/figure.py",
line 884, in draw func(*args)
File
"/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/artist.py",
line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File
"/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/axes.py",
line 1983, in draw
a.draw(renderer) File
"/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/artist.py",
line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs)
File
"/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/patches.py",
line 385, in draw gc.set_linewidth(lw)TypeError: a float is required
Traceback (most recent call last): File
"/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/artist.py",
line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs)
File
"/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/figure.py",
line 884, in draw func(*args) File
"/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs) File
"/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/axes.py",
line 1983, in draw a.draw(renderer)
File
"/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/artist.py",
line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File
"/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/patches.py",
line 385, in draw
gc.set_linewidth(lw)TypeError: a float is
required==================================================================================
Then I looked into the
file /Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/patches.py
at the line 384 the code is: gc.set_linewidth(lw)I added "lw = np.float(lw)"
before "gc.set_linewidth(lw)", then the example code runs successfully.
Any help?
Thanks for any reply.
--
Mingkui Li
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