Someplace to start:
----
from matplotlib import cm
shade = cm.bone_r
cmstep = shade.N/len(vg_bulk) #TODO: even *more* elegant to space
colors by time elapsed
for ii in range(len(vg_bulk)):
hue = shade(ii*cmstep)
#convert to moles
for iii in (0,1,2):
vg_bulk[ii][1][iii] = vg_bulk[ii][1][iii]*(10**6*22.4)**-1
ba.plot(vg_bulk[ii][1], vg_sites,
color = hue, linestyle=':', marker='o',label='%d
days'%vg_bulk[ii][0])
----
and here's what I do for linestyle themes, when I don't know how many
lines I'm going to plot but want adjacent ones to be different (and a
set of less than seven looks nice):
----
from itertools import cycle
self.linestyleskwargs = cycle(map(lambda tu:
dict(zip(('color','dashes'),tu)), (('0.5',(4,1,1,1)),('0.4',(2,1)),
('0.3',(5,1,2,1)),('0.2',(4,1)),('0.1',(6,1)), ('0.0',(10,1)))))
for g in self.gases.values():
style = self.linestyleskwargs.next()
p.plot(g.conc,n.linspace(0,self.depth,self.depth/
self.delx),label=g.label, **style)
----
I'm sure either of these examples can be made tidier, or they could be
combined, or one could set up something to replot all the lines in an
existing plot, with nicely spaced colors, once you know how many there
are.
&C
On Jan 16, 2009, at 3:37 PM, Yang Zhang wrote:
> I'm no good at choosing colors. Does matplotlib have a way to
> automatically assign colors (based on a theme), or provide a way to
> choose a color from a theme? (Excel 2007 opened my eyes to this.)
> Currently, when I do:
>
> bar(..., color = 'r', ...)
> bar(..., color = 'y', ...)
> bar(..., color = 'b', ...)
>
> I usually just choose one of the primary colors. It would be nice
> if I
> could instead write the following (or better if the colors could be
> assigned automagically), so I needn't worry about choosing colors:
>
> bar(..., color = themecolor(0), ...)
> bar(..., color = themecolor(1), ...)
> bar(..., color = themecolor(2), ...)
>
> I see these things called colormaps on the home page documentation,
> but
> I can't figure out how to use these (calling autumn() before plotting
> made no change to my plot) or whether they're even what I'm looking
> for.
> Or perhaps there's some Python package out there completely unrelated
> to matplotlib that I could use? Thanks in advance for any hints.
> --
> Yang Zhang
> http://www.mit.edu/~y_z/
>
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Chloe Lewis
Graduate student, Amundson Lab
Division of Ecosystem Sciences, ESPM
University of California, Berkeley
137 Mulford Hall - #3114
Berkeley, CA 94720-3114
chle...@nature.berkeley.edu
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