Error in demo scripts: to_rgba: Invalid rgba arg "2" in style_sheets_reference.py #8106
Description
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Bug report
I tried to plot a "barplot" referring to the demo scripts in http://matplotlib.org/examples/style_sheets/style_sheets_reference.html.
But the console showed :
ValueError: to_rgba: Invalid rgba arg "2"
to_rgb: Invalid rgb arg "2"
gray (string) must be in range 0-1
on this line: ax.bar(np.arange(6)+0.25,test_cas,0.25,color='C2')
Code for reproduction
http://matplotlib.org/mpl_examples/style_sheets/style_sheets_reference.py
Actual outcome
- The output produced by the above code, which may be a screenshot, console output, etc.
E:\Programing\Python>ipython style_sheets_reference.py
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
E:\Programing\Python\style_sheets_reference.py in <module>()
142 for style_label in style_list:
143 with plt.style.context(style_label):
--> 144 fig = plot_figure(style_label=style_label)
145
146 plt.show()
E:\Programing\Python\style_sheets_reference.py in plot_figure(style_label)
118 plot_scatter(axes[0], prng)
119 plot_image_and_patch(axes[1], prng)
--> 120 plot_bar_graphs(axes[2], prng)
121 plot_colored_circles(axes[3], prng)
122 plot_colored_sinusoidal_lines(axes[4])
E:\Programing\Python\style_sheets_reference.py in plot_bar_graphs(ax, prng, min_value, max_value, nb_samples)
44 width = 0.25
45 ax.bar(x, ya, width)
---> 46 ax.bar(x + width, yb, width, color='C2')
47 ax.set_xticks(x + width)
48 ax.set_xticklabels(['a', 'b', 'c', 'd', 'e'])
C:\Users\yanya\Miniconda2\lib\site-packages\matplotlib\__init__.pyc in inner(ax, *args, **kwargs)
1816 warnings.warn(msg % (label_namer, func.__name__),
1817 RuntimeWarning, stacklevel=2)
-> 1818 return func(ax, *args, **kwargs)
1819 pre_doc = inner.__doc__
1820 if pre_doc is None:
C:\Users\yanya\Miniconda2\lib\site-packages\matplotlib\axes\_axes.pyc in bar(self, left, height, width, bottom, **kwargs)
2015 color = [None] * nbars
2016 else:
-> 2017 color = list(mcolors.colorConverter.to_rgba_array(color))
2018 if len(color) == 0: # until to_rgba_array is changed
2019 color = [[0, 0, 0, 0]]
C:\Users\yanya\Miniconda2\lib\site-packages\matplotlib\colors.pyc in to_rgba_array(self, c, alpha)
420 result = np.zeros((nc, 4), dtype=np.float)
421 for i, cc in enumerate(c):
--> 422 result[i] = self.to_rgba(cc, alpha)
423 return result
424
C:\Users\yanya\Miniconda2\lib\site-packages\matplotlib\colors.pyc in to_rgba(self, arg, alpha)
374 except (TypeError, ValueError) as exc:
375 raise ValueError(
--> 376 'to_rgba: Invalid rgba arg "%s"\n%s' % (str(arg), exc))
377
378 def to_rgba_array(self, c, alpha=None):
ValueError: to_rgba: Invalid rgba arg "2"
to_rgb: Invalid rgb arg "2"
gray (string) must be in range 0-1
Matplotlib version
install by anaconda
conda 4.3.11
Python 2.7.12
IPython 5.1.0
In [3]: matplotlib.__version__
Out[3]: '1.5.3'