facecolor kwarg for Matplotlib stacked histogram

问题:

I am having trouble controlling the color and linestyle of histogram plotted using Matplotlib's hist function with stacked=True. For a single non-stacked histogram, I have no trouble:

import pylab as P  mu, sigma = 200, 25 x0 = mu + sigma*P.randn(10000)  n, bins, patches = P.hist(     x0, 20,     histtype='stepfilled',     facecolor='lightblue'     ) 

However, when I introduce additional histograms,

import pylab as P  mu, sigma = 200, 25 x0 = mu + sigma*P.randn(10000) x1 = mu + sigma*P.randn(7000) x2 = mu + sigma*P.randn(3000)  n, bins, patches = P.hist(     [x0,x1,x2], 20,     histtype='stepfilled',     stacked=True,     facecolor=['lightblue','lightgreen','crimson']     ) 

it throws the following error:

ValueError: to_rgba: Invalid rgba arg "['lightblue', 'lightgreen', 'crimson']" could not convert string to float: lightblue 

Using the color=['lightblue', 'lightgreen', 'crimson'] option does work, but I would like to have direct control of the fill and line colors separately while being able to use the named Matplotlib colors. I am using version 1.2.1 of Matplotlib.

回答1:

facecolor needs to be a single named color, not a list, but adding this after your P.hist usage might get the job done for you:

for patch in patches[0]: patch.set_facecolor('lightblue') for patch in patches[1]: patch.set_facecolor('lightgreen') for patch in patches[2]: patch.set_facecolor('crimson') 

文章来源: facecolor kwarg for Matplotlib stacked histogram