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 ()
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())
63 if name == ‘main’:
/Library/Python/2.5/site-packages/matplotlib/axes.pyc in set_default_color_cycle(clist)
114 _process_plot_var_args.defaultColors = clist[:]
–> 115 rcParams[‘lines.color’] = clist
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.validatekey
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 <tonyyu@…1166…> wrote:
Not too long ago, I posted an example of this to the list. 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,
On Jul 14, 2009, at 9:51 AM, per freem wrote:
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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