在海洋直方图上添加标准普通pdf [英] Add a standard normal pdf over a seaborn histogram

问题描述

我想在使用 seaborn 构建的直方图上添加标准的正常pdf曲线.

 将numpy导入为np将seaborn导入为snsx = np.random.standard_normal(1000)sns.distplot(x，kde = False) 

任何帮助将不胜感激！

解决方案

I would like to add a standard normal pdf curve over a histogram built with seaborn.

import numpy as np
import seaborn as sns 
x = np.random.standard_normal(1000)
sns.distplot(x, kde = False)

Any help would be appreciated!

解决方案

scipy.stats.norm gives easy access to the pdf of a normal distribution with
known parameters; by default it corresponds to the standard normal, mu=0, sigma=1.

For this to correspond correctly to your sampled data, the histogram should
display densities and not counts, so use norm_hist=True in the seaborn.distplot call.

import numpy as np                                                              
import seaborn as sns                                                           
from scipy import stats                                                         
import matplotlib.pyplot as plt                                                 

x = np.random.standard_normal(1000)                                             
ax = sns.distplot(x, kde = False, norm_hist=True)                                    

# calculate the pdf over a range of values
xx = np.arange(-4, +4, 0.001)                                                   
yy = stats.norm.pdf(xx)                                                         
# and plot on the same axes that seaborn put the histogram
ax.plot(xx, yy, 'r', lw=2)                                                     

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