Hi Tony,
thanks for the pointer. that code does not run for me, it generates the
following error:
ttributeError Traceback (most recent call last)
color_cycle.py in <module>()
63 if __name__ == '__main__':
64 n_lines = 10
---> 65 cycle_cmap(length=n_lines)
66 x = np.linspace(0, 10)
67 for shift in np.linspace(0, np.pi, n_lines):
color_cycle.py in cycle_cmap(cmap, length)
59 idx = np.linspace(crange['start'], crange['stop'],
length).astype(np.int)
60 colors = cm(idx)
---> 61 mpl.axes.set_default_color_cycle(colors.tolist())
62
63 if __name__ == '__main__':
/Library/Python/2.5/site-packages/matplotlib/axes.pyc in
set_default_color_cycle(clist)
113 """
114 _process_plot_var_args.defaultColors = clist[:]
--> 115 rcParams['lines.color'] = clist[0]
116
117 class _process_plot_var_args:
/Library/Python/2.5/site-packages/matplotlib/__init__.pyc in
__setitem__(self, key, val)
603 instead.'% (key, alt))
604 key = alt
--> 605 cval = self.validate[key](val)
606 dict.__setitem__(self, key, cval)
607 except KeyError:
/Library/Python/2.5/site-packages/matplotlib/rcsetup.pyc in
validate_color(s)
160 def validate_color(s):
161 'return a valid color arg'
--> 162 if s.lower() == 'none':
163 return 'None'
164 if is_color_like(s):
AttributeError: 'list' object has no attribute 'lower'
WARNING: Failure executing file: <color_cycle.py>
any idea what might be wrong?
On Tue, Jul 14, 2009 at 10:14 AM, Tony S Yu <ton...@mit.edu> wrote:
> Not too long ago, I posted an example of this to the
> list<http://www.nabble.com/Where-to-post-examples-%2528specifically%252C-one-that-may-be-useful-for-time-evolution-plots%2529-td23901837.html>.
> The code near the bottom of that thread is a little more general than the
> one at the top and shows, three different ways to cycle through the colors
> of a colormap.
>
> Hope that helps,
> -Tony
>
>
> On Jul 14, 2009, at 9:51 AM, per freem wrote:
>
> Hi all,
>
> i would like to set the colors of the lines i plot (using the plot
> function) to go from red to blue, in evenly spaced interval. that is,
> imagine a color map from red to green, where i plot n-many lines, each
> receiving a color from this color map, starting at the red end and going to
> green.
>
> the docs say how to set the color cycle of lines set by plot, using:
>
> matplotlib.axes.set_default_color_cycle(['r', 'y', 'g', 'b'])
>
> but this only allows me to use named colors, and here i am looking to use
> shades from red to green.
> my question is: first, how can i generate N evenly spaced colors from the
> red spectrum to the green spectrum? and two, how can i make it so plot uses
> these colors for its line plots?
>
> thanks very much.
>
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