matplotlib - 如何使用 matplotlib 在两条直方图线之间完成颜色填充？

Question

我有两个直方图(信号和背景)，每个直方图都有不确定性上限和下限。我想将每个直方图绘制为仅使用没有填充的彩色边缘，然后用它们自己的没有填充的彩色边缘绘制上部和下部不确定性直方图，然后填充上部和下部直方图之间的区域，如一种低调的乐队。如何实现这一目标？

这是我刚才的非常粗略的代码(可以在 Jupyter 中使用):

import matplotlib.pyplot as plt
import numpy as np
from pylab import normal
import seaborn as sns
sns.set(context="paper", font="monospace")
import warnings
warnings.filterwarnings('ignore')

%matplotlib inline
plt.rcParams["figure.figsize"] = [8, 8]
plt.rc("text", usetex=True)
plt.rc("font", family="serif")

s    = normal(1, .2, 5000)
s_up = normal(1, .2, 5500)
s_dn = normal(1, .2, 4600)
b    = normal(2, .2, 2500)

ns, bins, patches = plt.hist(
    [s, s_up, s_dn, b],
    color=['r', 'g', 'g', 'b'],
    label=['signal nominal', 'signal upper bound', 'signal lower bound', 'background'],
    alpha=0.5,
    linewidth=1,
    histtype='stepfilled');
plt.setp(patches[0], edgecolor='r')
plt.setp(patches[1], edgecolor='b')
plt.legend();
plt.show();

Answer 1

类似的事情？

s    = normal(1, .2, 5000)
s_up = normal(1, .2, 5500)
s_dn = normal(1, .2, 4600)

bins = np.linspace(0., 2., 21)

n_up,b_up,p_up = plt.hist(s_up, bins=bins,  bottom=0, linewidth=1, histtype='stepfilled', facecolor='none', edgecolor='red', linestyle='--', label='signal upper bound')
n_dn,b_dn,p_dn = plt.hist(s_dn, bins=bins,  bottom=0, linewidth=1, histtype='stepfilled', facecolor='none', edgecolor='green', linestyle='--', label='signal lower bound')
n,b,p = plt.hist(s, bins=bins, bottom=0, linewidth=2, histtype='stepfilled', facecolor='none', edgecolor='k', label='signal nominal')
plt.bar(x=b_up[:-1], height=n_up-n_dn, bottom=n_dn, width=np.diff(b_up), align='edge', linewidth=0, color='red', alpha=0.25, zorder=-1, label='uncertainty band')
plt.legend()