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Python - Wrapped Cauchy Distribution in Statistics

Last Updated : 10 Jan, 2020
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scipy.stats.wrapcauchy() is a wrapped Cauchy continuous random variable. It is inherited from the of generic methods as an instance of the rv_continuous class. It completes the methods with details specific for this particular distribution. Parameters :
q : lower and upper tail probability x : quantiles loc : [optional]location parameter. Default = 0 scale : [optional]scale parameter. Default = 1 size : [tuple of ints, optional] shape or random variates. moments : [optional] composed of letters [‘mvsk’]; ‘m’ = mean, ‘v’ = variance, ‘s’ = Fisher’s skew and ‘k’ = Fisher’s kurtosis. (default = ‘mv’). Results : wrapped Cauchy continuous random variable
Code #1 : Creating wrapped Cauchy continuous random variable Python3 1==
# importing library

from scipy.stats import wrapcauchy 
  
numargs = wrapcauchy .numargs 
a, b = 0.2, 0.8
rv = wrapcauchy (a, b) 
  
print ("RV : \n", rv)  
Output :
RV : 
 scipy.stats._distn_infrastructure.rv_frozen object at 0x000002A9DB1EFEC8
Code #2 : wrapped Cauchy continuous variates and probability distribution Python3 1==
import numpy as np 
quantile = np.arange (0.01, 1, 0.1) 

# Random Variates 
R = wrapcauchy .rvs(a, b, size = 10) 
print ("Random Variates : \n", R) 

# PDF 
x = np.linspace(wrapcauchy.ppf(0.01, a, b),
                wrapcauchy.ppf(0.99, a, b), 10)
R = wrapcauchy.pdf(x, 1, 3)
print ("\nProbability Distribution : \n", R) 
Output :
Random Variates : 
 [4.86261249 3.08013229 2.12625546 2.11690773 4.07188434 3.3251514
 1.23202529 3.38334847 1.22842627 6.35459436]

Probability Distribution : 
 [nan nan nan nan nan nan nan nan nan nan]

Code #3 : Graphical Representation. Python3 1==
import numpy as np 
import matplotlib.pyplot as plt 
   
distribution = np.linspace(0, np.minimum(rv.dist.b, 2)) 
print("Distribution : \n", distribution) 
Output :

Distribution : 
 [0.         0.04081633 0.08163265 0.12244898 0.16326531 0.20408163
 0.24489796 0.28571429 0.32653061 0.36734694 0.40816327 0.44897959
 0.48979592 0.53061224 0.57142857 0.6122449  0.65306122 0.69387755
 0.73469388 0.7755102  0.81632653 0.85714286 0.89795918 0.93877551
 0.97959184 1.02040816 1.06122449 1.10204082 1.14285714 1.18367347
 1.2244898  1.26530612 1.30612245 1.34693878 1.3877551  1.42857143
 1.46938776 1.51020408 1.55102041 1.59183673 1.63265306 1.67346939
 1.71428571 1.75510204 1.79591837 1.83673469 1.87755102 1.91836735
 1.95918367 2.        ]
  
Code #4 : Varying Positional Arguments Python3 1==
import matplotlib.pyplot as plt 
import numpy as np 

x = np.linspace(0, 5, 100) 
   
# Varying positional arguments 
y1 = wrapcauchy.pdf(x, a, b) 
y2 = wrapcauchy.pdf(x, a, b) 
plt.plot(x, y1, "*", x, y2, "r--") 
Output :

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